Dictionary.com

radius

[ rey-dee-uhs ]
/ 藞re瑟 di 蓹s /
Save This Word!
See synonyms for: radius / radii on Thesaurus.com

Definition of radius

noun, plural ra路di路i [rey-dee-ahy], /藞re瑟 di藢a瑟/, ra路di路us路es.
QUIZ
WILL YOU SAIL OR STUMBLE ON THESE GRAMMAR QUESTIONS?
Smoothly step over to these common grammar mistakes that trip many people up. Good luck!
Question 1 of 7
Fill in the blank: I can鈥檛 figure out _____ gave me this gift.

Origin of radius

1590鈥1600; <Latin: staff, rod, spoke, beam, originally, ray1

WORDS THAT MAY BE CONFUSED WITH radius

circumference, diameter, radius , tangent
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, 漏 Random House, Inc. 2022

How to use radius in a sentence

British Dictionary definitions for radius

radius
/ (藞re瑟d瑟蓹s) /

noun plural -dii (-d瑟藢a瑟) or -diuses

Word Origin for radius

C16: from Latin: rod, ray, spoke
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition 漏 William Collins Sons & Co. Ltd. 1979, 1986 漏 HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for radius

radius
[ r膩d膿-蓹s ]

Plural radii (r膩d膿-墨鈥) 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庐 Science Dictionary Copyright 漏 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
FEEDBACK