Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

EXAMPLES FROM THE WEB FOR RADIUS

Delve from the surface of your sphere to its heart, and at once your radius joins every other.

R represents the radius of the curve upon which the vehicle is moving.

If he kept her out of the radius of disapproval, she might never feel a shadow of regret.

It was then that Wilson stepped into the radius of shallow light.

There isn't a well like mine in a radius of a hundred miles.

To double-check, he used the radius of the Galaxy as base to calculate the distance.

Within a radius of five miles of its base, the city was plunged into darkness.

From half this radius, marked 1, draw a line to apex, marked 2.

They must not, indeed they cannot, be properly prophetic within the radius.

Within a radius of three miles of Ammons three tractors ran all day.

WORD ORIGIN

1590s, "cross-shaft," from Latin radius "staff, stake, rod; spoke of a wheel; ray of light, beam of light; radius of a circle," of unknown origin. Perhaps related to radix "root," but Tucker suggests connection to Sanskrit vardhate "rises, makes grow," via root *neredh- "rise, out, extend forth;" or else Greek ardis "sharp point."

The geometric sense first recorded 1610s. Plural is radii. Meaning "circular area of defined distance around some place" is attested from 1953. Meaning "shorter bone of the forearm" is from 1610s in English (the Latin word had been used thus by the Romans).

MORE RELATED WORDS FOR RADIUS

Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.