| absorbed dose |
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noun
- The amount of energy imparted by nuclear (or ionizing) radiation to unit mass of absorbing material. The unit is the rad.
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| absorber |
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noun
- One who, or that which, absorbs.
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| absorption |
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noun
- The act or process of absorbing or sucking in anything, or of being absorbed and made to disappear; as, the absorption of bodies in a whirlpool, the absorption of a smaller tribe into a larger.
- (context, chemistry, physics) An imbibing or reception by molecular or chemical action; as, the absorption of light, heat, electricity, etc.
- (physiology) In living organisms, the process by which the materials of growth and nutrition are absorbed and conveyed to the tissues and organs.
- Entire engrossment or occupation of the mind; as, absorption in some employment.
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| absorption band |
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noun
- (physics),(chemistry) one of any number of ranges of wavelengths of electromagnetic radiation absorbed by a substance
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| absorptivity |
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noun (absorptiviti, es)
- The quality of being absorptive; absorptiveness.
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| accelerator |
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noun Often used adjectivally
- One who, or that which, accelerates.
- A device for causing acceleration.
- A substance which speeds up chemical reactions.
- accelerator pedal.
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| accelerometer |
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noun - An instrument for measuring acceleration
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| acceptor |
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noun
- One who accepts.
- (context, In law and commerce) one who accepts a draft or a bill of exchange; a drawee after he has accepted.
- (chemistry) an atom or molecule which can accept an electron to form a chemical bond.
- (physics) a chemical acceptor atom forming a positive hole in a semiconductor.
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| acoustician |
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noun
- One versed in acoustics, especially a physicist who specializes in acoustics
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| acoustics |
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noun See -ics regarding the treatment of such nouns as singular.
- The quality of a space for doing music.
- Until they discovered the non-contractual concrete slab under the stage floor, everyone at Carnegie Hall wondered, since the renovations, why the had changed.
- (physics) The science of sounds, teaching their nature, phenomena, and laws.
- Acoustics, then, or the science of sound, is a very considerable branch of physics. - Sir John Herschel.
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| actinic |
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adjective - Of, or relating to actinism
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| adhere |
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verb (adher, ing)
- (intransitive) To stick fast or cleave
- etymology 2 , cleave, as a glutinous substance does; to become joined or united; as, wax to the finger; the lungs sometimes adhere to the pleura.
- (intransitive) To hold, be attached, or devoted; to remain fixed, either by personal union or conformity of faith, principle, or opinion; as, men adhere to a party, a cause, a leader, a church.
- (intransitive) To be consistent or coherent; to be in accordance; to agree.
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| adhesion |
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noun
- The ability of a substance to stick to an unlike substance.
- A feeling of attachment (e.g. an infant to its parents).
- An agreement to adhere
- (medicine) An abnormal union of surface by the formation of new tissue resulting from an inflammatory process.
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| adhesive |
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noun
- A substance, such as glue, that provides or promotes adhesion.
adjective
- sticky, Sticky; tenacious, as glutinous substances.
- apt, Apt or tending to adhere; clinging.
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| aeolipile |
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noun
- an instrument used to demonstrate the force at which heated vapour escapes from a vessel through a narow aperture
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| aerate |
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verb (aerates, aerating, aerated)
- To supply oxygen or air.
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| aerometer |
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noun
- An instrument used to measure the mass and density of gases
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| air pressure |
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noun
- atmospheric pressure
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| allowed |
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verb
- (past of, allow)
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| alpha particle |
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noun - A positively charged nucleus of a helium-4 atom (consisting of two protons and two neutrons), emitted as a consequence of radioactivity.
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| alpha ray |
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noun
- a stream of alpha particles.
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| amplitude |
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noun
- the measure of something's size; magnitude
- (mathematics) the maximum absolute value of the vertical component of a periodic curve
- (physics) the maximum absolute value of some quantity that varies periodically
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| angular |
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noun
- (context, anatomy) A bone in the base of the lower jaw of many birds, reptiles, and fishes.
adjective
- Relating to an angle or to angles; having an angle or angles; forming an angle or corner; sharp-cornered; pointed; as, an angular figure.
- Measured by an angle; as, angular distance.
- (Figurative) Lean; lank; raw-boned; ungraceful; sharp and stiff in character; as, remarkably angular in his habits and appearance; an angular female.
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| angular acceleration |
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noun
- (classical mechanics) The rate of change of angular velocity, often represented by α.
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| angular velocity |
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noun
- (math) (physics) The angle travelled, in a given time, by a body rotating about an axis, the rate of motion through an angle.
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| anharmonic |
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adjective - Perturbed harmonic.
- An anharmonic oscillator is a perturbed version of a harmonic oscillator.
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| anisotropic |
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adjective
- (physics) Having properties that differ according to the direction of measurement; exhibiting anisotropy.
- The crystal has an structure, as it is stronger along its length than laterally.
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| antielectron |
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noun - (physics) a positron
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| antimatter |
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noun (uncountable)
- (physics) Matter that is composed of the antiparticles of those that constitute normal matter.
adjective (no comparative or superlative)
- Consisting of antimatter.
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| antineutrino |
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noun
- the antiparticle of the neutrino
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| antineutron |
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noun - (physics) The antiparticle corresponding to a neutron
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| antinode |
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noun - (physics) a region of maximum amplitude situated between adjacent nodes of a vibrating body, such as a string
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| antiparticle |
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noun
- (particles) A subatomic particle corresponding to another particle with the same mass, spin and mean lifetime but with charge, parity, strangeness and other quantum numbers flipped in sign.
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| antiproton |
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noun
- The antiparticle of the proton, having a negative electric charge
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| antiquark |
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noun
- (particles) the antiparticle of a quark
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| atmometer |
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noun
- An instrument that measures the rate of evaporation of a liquid
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| atmosphere |
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noun (wikipedia, atmosphere, Atmosphere (layer of gases))
- The gases surrounding the Earth or any astronomical body.
- The air in a particular place.
- The mood or feeling in a situation.
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| atomic |
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adjective
- Of, or relating to atoms
- A stream of hydrogen is emitted
- Of, or employing nuclear energy or processes
- We built a small bomb in the garage
- Infinitesimally small
- The hairs on a bedbug are almost
- Unable to be split or made any smaller
- A bit is an item of data
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| atomic mass unit |
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noun - (chemistry) a unit of mass equal to 1/12 the mass of an atom of the 12C isotope of carbon
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| atomic orbital |
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noun
- (quantum), (chemistry) The quantum mechanical behaviour of an electron in an atom describing the probability of the electron's particular position and energy.
- A particular atomic orbital associated with a given set of quantum numbers.
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| atomic pile |
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noun - (physics) an early nuclear reactor fuelled by uranium and moderated with graphite
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| atomize |
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verb to atomize
- to separate into atoms
- to make into a fine spray
- to fragment (can be used metaphorically)
- to bomb with nuclear weapons
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| attenuation |
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noun
- A gradual diminishing in the strength of something
- (physics) A reduction in the level of some property with distance, especially the amplitude of a wave or the strength of a signal
- (biology) A weakening in the virulence of a pathogen or other microorganism
- (botany) The tapering of a leaf etc to a fine point
- (engineering) A fabrication process in which a material is stretched out into a thin shape
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| attract |
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verb
- To pull toward without touching
- A magnet attracts iron filings
- To arouse interest or desire
- Advertising is designed to attract customers
- To bring upon oneself
- Bizarre behavior is sure to attract attention
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| attraction |
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noun
- The tendency to attract
- The Moon is held in its orbit by the attraction of the Earth's gravity
- The feeling of being attracted
- I felt a strange attraction towards the place
- An event or location that has a tendency to attract visitors
- The new mall should be a major attraction
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| avalanche |
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noun
- A large mass or body of snow and ice sliding swiftly down a mountain side, or falling down a precipice.
- A fall of earth, rocks, etc., similar to that of an avalanche of snow or ice.
- A sudden, great, or irresistible descent or influx of anything.
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