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rad 1

A unit of energy absorbed from ionizing radiation, equal to 100 ergs per gram or 0.01 joule per kilogram of irradiated material. It has been replaced as a standard scientific unit by the gray.

[r(adiation) a(bsorbed) d(ose).]

rad 2

adj. Slang
Excellent; wonderful.

[Short for radical.]

rad 3

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Units) 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]


symbol for
(Units) radian
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014



n. Physics.
a unit of absorbed dose equal to 0.01 Gy. Compare dose (def. 4).
[1915–20; shortening of radiation]



1. Informal. a radical.
2. Slang. fine; wonderful.
[1820–30; shortening of radical]




1. radical.
2. radix.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


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® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. A unit of radiation absorbed from a radioactive source.
2. A short form of radian, a unit of measure for plane angles. See centrad.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.rad - a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material
radioactivity unit - a measure of radioactivity
2.rad - the unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees)
angular unit - a unit of measurement for angles
milliradian - a unit of angular distance equal to one thousandth of a radian
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
In an interveiw with the Jamaica Information Service (JIS) Sherlock Marriott-Blake pointed out that only 400 students are currently enrolled in JAD schools, representing approximately 50 per cent of capacity.
"These were the funds he received to move the JAD cells in Indonesia," he added.
Caption: Elysa Hammond and Jad Daley volunteering at American Forests' planting in Phoenix.
This hit close to home, as her own son, Jad, was rejected 22 times before a mainstream school accepted him.
Jad Elias, VP Maserati Sales at Al Tayer Motors said: "We were pleased to welcome Ultraviolet Racing to the service centre and were impressed with their thirst for automotive knowledge.
Industry Partner of the Year JAD Building Maintenance Supplies; Humanitarian of the Year Daniel Durante, ARM, RY Management, for his decades of dedication and volunteerism.
The semi-official Sudan Media Center (SMC) has quoted Jad al-Sid as saying Central Darfur is witnessing full stability in all of its localities.
Jad, a 27-year-old security engineer who asked for his identity and the location of the data center to be concealed, said he had two main concerns.
(20) It is then that, according to local Islamists, he started holding pro-Islamic State Islamic studies sessions and "started to gather ISIS sympathizers around him." (21) Whether or not ustadz Khalid is a formal member of the pro-Islamic State group Jemaah Ansharut Daulah (JAD) or is an off-structure pro-Islamic State cleric remains unclear so far.
"We are excited to expand our bakery portfolio through this partnership with CSM Bakery Solutions, whose reputation as the world's leading supplier of high quality bakery products gels well with our strategy to offer wider choices to growing F&B consumer base in the UAE," said Jad Asaad, marketing manager, Horeca Trade.
Aman is one of the influential jihadi ideologues among Islamist militants groups like the local Jamaah Ansharud Daulah (JAD) terror group.