rad


Mathematics.

radian; radians.

Definition for rad (2 of 4)

rad

1
[ rad ]
/ ræd /

noun Physics.

a standard unit of absorbed dose of radiation equal to 0.01 gray2.
Compare dose(def 4a).

Origin of rad

1
First recorded in 1915–20; shortened form of radiation

Definition for rad (3 of 4)

rad

2
[ rad ]
/ ræd /

noun

Informal. radical.

adjective

Slang. fine; wonderful.

Origin of rad

2
by shortening of radical

Definition for rad (4 of 4)

rad.


Mathematics.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for rad

British Dictionary definitions for rad (1 of 3)

rad

1
/ (ræd) /

noun

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

Word Origin for rad

C20: shortened from radiation

British Dictionary definitions for rad (2 of 3)

rad

2

symbol for

radian

British Dictionary definitions for rad (3 of 3)

rad.


abbreviation for

radical
radius
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Science definitions for rad

rad

[ răd ]

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.

Culture definitions for rad

rad


An acronym for radiation absorbed dose. A unit of energy absorbed from ionizing radiation.

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.