radius
[ rey-dee-uhs ]
/ ˈreɪ di əs /
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noun, plural ra·di·i [rey-dee-ahy], /ˈreɪ diˌaɪ/, ra·di·us·es.
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Origin of radius
1590–1600; <Latin: staff, rod, spoke, beam, originally, ray1
WORDS THAT MAY BE CONFUSED WITH radius
circumference, diameter, radius , tangentDictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
British Dictionary definitions for radius
radius
/ (ˈreɪdɪəs) /
noun plural -dii (-dɪˌaɪ) or -diuses
Word Origin for radius
C16: from Latin: rod, ray, spoke
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Scientific definitions for radius
radius
[ rā′dē-əs ]
Plural radii (rā′dē-ī′) radiuses
A line segment that joins the center of a circle or sphere with any point on the circumference of the circle or the surface of the sphere. It is half the length of the diameter.
The shorter and thicker of the two bones of the forearm or the lower portion of the foreleg. See more at skeleton.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.