- radian; radians.
- a standard unit of absorbed dose of radiation equal to 0.01 gray2.
Compare dose(def 4a).
Origin of rad1
First recorded in 1915–20; shortened form of radiation
- Informal. radical.
- Slang. fine; wonderful.
Origin of rad2
by shortening of radical
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Related Wordsastonishing, fantastic, outrageous, spectacular, incredible, phenomenal, awesome, astounding, unbelievable, superb, terrific, marvelous, breathtaking, remarkable, offbeat, neat, groovy, unorthodox, great, satisfying
Examples from the Web for rad
Jim really paved the way—on film and in television—for people to see young, rad chicks kick ass and take names.Jessica Alba on 'Sin City,' Typecasting, and How Homophobia Pushed Her Away From the Church
August 18, 2014
If Hugh Jackman is totally heterosexual, his mode is a confusing—and not in a good, rad way—butch-camp.
Nashville: Broadman Holman Publishers, 1996 Rad, Gerhard von.The Backstory of ‘Noah’ Is Full of Giants, Horny Angels, and a Grieving God
March 28, 2014
In October 2007, Hourani launched his first ready-to-wear unisex line, RAD by Rad Hourani, at a small art gallery in Paris.Rad Hourani, The First Unisex Couture Designer
January 29, 2014
The ‘Today’ Show Horses Around Who knew David Gregory was such a rad dancer?Ai Weiwei, Ban Ki-moon, Ponies & More Best ‘Gangnam Style’ Parodies (VIDEO)
Melissa Leon, Kevin Fallon
October 26, 2012
"Well, we've got a pretty good outfield as it is," went on Rad.
"Go to it, boys," he advised Joe and Rad, with a friendly nod.
"Which will be about to-morrow," spoke Rad, as Joe mentioned his desire.
Joe and Rad, with the two men, were comparatively alone now.
"One of the porters might have opened our door by mistake," went on Rad.
- a former unit of absorbed ionizing radiation dose equivalent to an energy absorption per unit mass of 0.01 joule per kilogram of irradiated material. 1 rad is equivalent to 0.01 gray
C20: shortened from radiation
Word Origin and History for rad
Online Etymology Dictionary, © 2010 Douglas Harper
- A unit used to measure energy absorbed by a material from radiation. One rad is equal to 100 ergs per gram of material. Many scientists now measure this energy in grays rather than in rads.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.