Nearby Words
noun, plural -di·i 
[-dee-ahy] , -di·us·es.
[-dee-ahy] , -di·us·es. 1.
a straight line extending from the center of a circle or sphere to the circumference or surface: The radius of a circle is half the diameter.
2.
the length of such a line.
3.
any radial or radiating part.
4.
a circular area having an extent determined by the length of the radius from a given or specified central point: every house within a radius of 50 miles.
5.
EXPANDa field or range of operation or influence.
6.
extent of possible operation, travel, etc., as under a single supply of fuel: the flying radius of an airplane.
7.
Anatomy. the bone of the forearm on the thumb side. Compare ulna (def. 1).
8.
Zoology. a corresponding bone in the forelimb of other vertebrates.
9.
Machinery Now Rare. the throw of an eccentric wheel or cam.
10.
a rounded corner or edge on a machined or cast piece of metal.
11.
COLLAPSEEntomology. one of the principal longitudinal veins in the anterior portion of the wing of an insect.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Radiuses
is always a great word to know.
So is ninnyhammer. Does it mean:
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| a fool or simpleton; ninny. |
Etymonline
Word Origin & History
radius
1597, "cross-shaft," from L. radius "staff, spoke of a wheel, beam of light," of unknown origin. Perhaps related to radix "root," but Tucker suggests connection to Skt. vardhate "rises, makes grow," via root *neredh- "rise, out, extend forth;" or else Gk. ardis "sharp point." The geometric sense first
EXPANDrecorded 1611. Plural is radii. Meaning "circular area of defined distance around some place" is attested from 1953. Meaning "shorter bone of the forearm" is from 1615 in Eng.; it was used thus by Roman writer Aulus Cornelius Celsus (1c.).
COLLAPSE
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary
radius ra·di·us (rā'dē-əs)
n. pl. ra·di·us·es or ra·di·i (-dē-ī')
A line segment that joins the center of a circle with any point on its circumference.
A long, prismatic, slightly curved bone, the shorter and thicker of the two forearm bones, located laterally to the ulna.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
| radius (rā'dē-əs) Pronunciation Key
Plural radii (rā'dē-ī') or radiuses
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The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
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