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Glossary of Anatomy Terms
beginning with letter R
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radial Tweet Definition of radial Like Definition of radial on Facebook
  1. a radial tire / radial tyre
  1. arranged like rays that radiate from, or converge to a common centre
  2. moving along a radius
  1. (anatomy) of, or relating to the radius bone
radius Tweet Definition of radius Like Definition of radius on Facebook
noun (radii, pl2=radiuses)
  1. (anatomy) The long bone in the forearm, on the side of the thumb.
  2. (geometry) A line segment between any point on the circumference of a circle and its center/centre.
  3. (geometry) The length of this line segment.
ramification Tweet Definition of ramification Like Definition of ramification on Facebook
  1. A consequence or development complicating a problem.
  2. (math) An arrangement of branches.
  3. (botany) The divergence of the stem and limbs of a plant into smaller ones, meaning trunk into branches, branches into increasingly smaller branches and so on.
raphe Tweet Definition of raphe Like Definition of raphe on Facebook
noun (raphae)
  1. (context, anatomy, botany) A ridge or seam on an organ, bodily tissue, or other structure, especially at the join between two halves or sections.
rectum Tweet Definition of rectum Like Definition of rectum on Facebook
noun (recta, pl2=rectums)
  1. (anatomy) The terminal part of the large intestine through which feces pass.
reflection Tweet Definition of reflection Like Definition of reflection on Facebook
  1. the act of reflecting or the state of being reflected
  2. the property of a propogated wave being thrown back from a surface (such as a mirror)
  3. something, such as an image, that is reflected
The dog barked at his own in the mirror.
  1. careful thought or consideration
After careful , I have decided not to vote for that proposition.
  1. an implied criticism
It is a on his character that he never wavered in his resolve.
region Tweet Definition of region Like Definition of region on Facebook
  1. Any considerable and connected part of a space or surface; specifically, a tract of land or sea of considerable but indefinite extent; a country; a district; in a broad sense, a place without special reference to location or extent but viewed as an entity for geographical, social or cultural reasons.
the equatorial regions
the temperate regions
the polar regions
the upper regions of the atmosphere
  1. An administrative subdivision of a city, a territory, a country or the European Union.
  2. (historical) Such a division of the city of Rome and of the territory about Rome, of which the number varied at different times; a district, quarter, or ward.
  3. (figuratively) The inhabitants of a region or district of a country.
  4. (anatomy) A place in or a part of the body in any way indicated.
the abdominal regions
  1. (obsolete) place, Place; rank; station; dignity.
  2. (obsolete) The space from the earth's surface out to the orbit of the moon: properly called the elemental region.
regional Tweet Definition of regional Like Definition of regional on Facebook
  1. something, such as a newspaper, that serves a region
  1. pertaining to or about a specific region or district
  2. of or relating to a large geographic region
  3. of or relating to one part of the body
reins Tweet Definition of reins Like Definition of reins on Facebook
  1. (archaic) The kidneys.
  2. The lower part of the back.
  1. (third-person singular of, rein)
retina Tweet Definition of retina Like Definition of retina on Facebook
noun (pl2=retinae)
  1. (anatomy) The thin layer of cells at the back of the eyeball where light is converted into neural signals sent to the brain.
rhombencephalon Tweet Definition of rhombencephalon Like Definition of rhombencephalon on Facebook
  1. (anatomy) The hindbrain.
rhomboid Tweet Definition of rhomboid Like Definition of rhomboid on Facebook
  1. A parallelogram whose adjacent sides are unequal in length
  2. Any of several muscles that control the shoulders
  1. resembling, or shaped like a rhombus or rhomboid
ringtail Tweet Definition of ringtail Like Definition of ringtail on Facebook
  1. a small carnivorous mammal, Bassariscus astutus, somewhat like a raccoon, native to the southwestern United States
Rod Tweet Definition of Rod Like Definition of Rod on Facebook
proper noun 
  1. (given name, male)
root Tweet Definition of root Like Definition of root on Facebook
  1. The part of a plant, generally underground, that absorbs water and nutrients.
  2. The part of a tooth extending into the bone holding the tooth in place.
  3. The part of a hair under the skin that holds the hair in place.
  4. source, Source.
The love of money is the of all evil
  1. (arithmetic) Of a number or expression, a number which, when raised to a specify, specified power, yields the specified number or expression.
The cube of 27 is 3.
  1. (arithmetic) A square root (understood if no power is specified; in which case, "the root of" is often abbreviated to "root").
Multiply by 2.
  1. (analysis) A zero (of a function).
  2. (context, graphtheory, computing) The single node of a tree that has no parent.
  3. (italbrac, philology) A word from which another word or words are derived.
  4. (computing) In UNIX terminology, the first user account with complete access to the operating system and its configuration, found at the root of the directory structure.
  5. (computing) The person who manages accounts on a UNIX system.
  1. To rummage, to search as if by digging in soil, to root out.
  2. To cheer to show support for a sports team, etc.
    • 1908, w:Jack Norworth, Jack Norworth, w:Take Me Out to the Ball Game, Take Me Out to the Ball Game
    • : Let me , , for the home team,
      1. (italbrac, Australian coarse slang) To have sexual intercourse.
rotator Tweet Definition of rotator Like Definition of rotator on Facebook
  1. One that rotates.
  2. (anatomy) A muscle by which a joint can be rotated.
rump Tweet Definition of rump Like Definition of rump on Facebook
  1. the hindquarters of an animal; a cut of beef or veal from the rump
  2. the buttocks

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