| hadron |
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noun
- (particles) A strongly interacting particle such as a proton. A particle which is affected by the strong nuclear force. A hadron is composed of quarks.
| | | half-life |
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noun - (physics) The time required for half of the nucleus, nuclei in a sample of a specific isotope to undergo radioactive decay.
- (chemistry) In a chemical reaction, the time required for the concentration of a reactant to fall from a chosen value to half that value.
- (medicine) The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacologic, physiologic, or radiologic activity. Year introduced in w:MeSH: 1974(1971)
- (culture) The time it takes for an idea or a fashion to lose half of its influential power. "Most books of scholarship have surprisingly short intellectual half-lives during which they make a difference" (Robert Ackerman, 1991. Introduction to Jane Ellen Harrison's Prolegomena to the Study of Greek Religion (1903).)
| | hard |
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adjective
- Resistant to pressure.
- Requiring a lot of effort to do or understand
- a hard problem
- Demanding a lot of effort to endure.
- a hard life
- (context, of a person) , severe, harsh, unfriendly, brutal.
- Unquestionable.
- hard evidence
- Of drink, strong.
- Of water, high in dissolved calcium compounds.
- (context, slang, vulgar) Sexually aroused.
- (bodybuilding) Having muscles that are tightened as a result of intense, regular exercise.
adverb (harder, hardest)
- With much strength or energy
| | harmonic |
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adjective
- Pertaining to harmony.
- Pleasant to hear; harmonious; melodious.
| | heat |
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noun
- (uncountable, physics) thermal energy
- This furnace puts out 5000 BTUs of .
- That engine is really throwing off some .
- Removal of from the liquid caused it to turn into a solid.
- (uncountable) The condition or quality of being hot.
- Stay out of the of the sun!
- (uncountable) An attribute of a spice that causes a burning sensation in the mouth.
- The chili sauce gave the dish .
- (uncountable) A period of intensity, particularly of emotion.
- It's easy to make bad decisions in the of the moment
- (uncountable) An undesirable amount of attention.
- The from her family after her DUI arrest was unbearable.
- (uncountable) (slang) The police.
- ''The ! Scram!
- (uncountable) (slang) A gun.
- He's packing .
- (countable) (baseball) A fastball.
- The catcher called for the , high and tight.
- (uncountable) A condition where a mammal is aroused sexually or where it is especially fertile and therefore eager to engage in sexual intercourse
- The male canines were attracted by the female in .
- (countable) A preliminary race, used to determine the participants in a final race
- The runner had high hopes, but was out of contention after the first .
- (countable) One cycle of bringing metal to maximum temperature and working it until it is too cool to work further
- I can make a scroll like that in a single .
- (countable) A hot spell<span id="heat13"></span>.
- The children stayed indoors during the summer heats.
verb
- To cause an increase in temperature of an object or space; to cause something to become hot; often with "up".
- I'll up the water.
- to arouse, to excite (sexually)
- The massage heated her up.
| | heavy |
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noun (pl2=heavies)
- A villain or bad guy; the one responsible for evil or aggressive acts.
- With his wrinkled, uneven face, the actor always seemed to play the in films.
- (slang) A doorman, bouncer
- A fight started outside the bar then the heavies came out and stopped it.
adjective (heavier, heaviest)
- (context, of a physical object) Having great weight.
- (context, of a topic) serious, Serious, somber.
- (context, UK, slang) Good.
- This film is .
- (context, of a rate of flow) high, High, great.
- (context, UK, slang) Armed.
- Come , or not at all.
- (context, Music terminology) louder, more distorted
- ''Metal is heavier than swing.
| | Heisenberg uncertainty principle |
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noun (wikipedia, uncertainty principle)
w:Heisenberg, Heisenberg uncertainty principle
- (physics) In quantum mechanics, the principle that there is an absolute limit on the combined accuracy of certain pairs of simultaneous, related measurements, especially that of the position and momentum of a particle.
| | hertz |
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noun (pl=hertz)
- In the International System of Units, the derived unit of frequency; one (period or cycle of any periodic event) per second. Symbol: Hz
| | Higgs boson |
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noun
- (particles) A hypothetical elementary particle predicted by the standard model; a boson with zero spin, it is thought to give mass to other particles.
| | Hooke's law |
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noun w:Hooke's law, Hooke's law
- (physics) the principle that the stress applied to a solid is directly proportional to the strain produced. This law describes the behavior of springs and solids stressed within their elastic limit.
| | | hot spot |
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noun (wikipedia, hotspot (geology))
(plural hot spots)
- (geology) the surface manifestation of a plume that rises from deep in the Earth"s mantle
- a dangerous place of violent political unrest
- a lively and entertaining place, such as a nightclub
- an area of radioactive contamination
- (genetics) the region of a gene in which there is higher than normal rate of mutation
- (computing) a location in which WiFi? Internet access is available
(wikipedia, hotspot (wifi))
| | hydromagnetics |
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noun
- magnetohydrodynamics
| | hypercharge |
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noun
- (physics) A quantum characteristic of a group of subatomic particles governed by the strong force that is related to strangeness and is represented by a number equal to twice the average value of the electric charge of the group.
| | hyperfine structure |
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noun
- (physics) a closely spaced structure of lines in the spectrum of an atom or molecule due to nuclear isotopic effects and/or to nuclear spin
| | hyperon |
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noun
- (physics) Any baryon with a non-zero strangeness.
| | hypersonic |
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adjective
- (context, of a speed) equal to, or greater than 5 times the speed of sound.
| | | hysteresis |
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noun
- A property of a system such that an output value is not a strict function of the corresponding input, but also incorporates some lag, delay, or history dependence, and in particular when the response for a decrease in the input variable is different from the response for an increase. For example, a thermostat with a nominal setpoint of 75° might switch the controlled heat source on when the temperature drops below 74°, and off when it rises above 76°.
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