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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 classic literature ?
And it was the nixt mornin', sure, jist as I was making up me mind whither it wouldn't be the purlite thing to sind a bit o' writin' to the widdy by way of a love-litter, when up com'd the delivery servant wid an illigant card, and he tould me that the name on it (for I niver could rade the copperplate printin on account of being lift handed) was all about Mounseer, the Count, A Goose, Look -- aisy, Maiter-di-dauns, and that the houl of the divilish lingo was the spalpeeny long name of the little ould furrener Frinchman as lived over the way.
I was still watching my poor lost com rade, when that happened to him against which even I was not proof.
"I hate everyone," she cried suddenly, and then broke forth into a ti- rade that frightened her escort.
He felt alone in space when his injured com- rade had disappeared.
All the passengers reached their destination, the Centre of Maghreb Youths in Rades, after receiving the necessary care.
Lors de ce championnat, le club marocain avait rAaAaAeA@alisAaAaAeA@ sept victo contre Kano Pillars (NigAaAaAeA@ria/112-83), City Oilers (Ouganda/ 91-81 Es Rades (Tunisie/78-71), Interclub (Angola/81-78), Ferroviario Beira (Mozambique/ 92-63) et Sport Libolo par (Ang/97-86), et perdu un seul match face AaAaAeA New Generation (RDC
The regular line will have a frequency of one crossing each 15 days, said the same source, with departure from Rades scheduled on Sunday and arrival to the port of Sagunto scheduled for Tuesday and the return on the same day to Rades and arrival to the Port of Rades on Thursday evening.
In a statement to TAP on the sidelines of the visit he paid Monday to the Port of Rades, he noted that this average did not exceed 3 to 4 containers per hour in the first four months of 2014 which impacted on the pace of operations and trade activities in the port and therefore caused investors' dissatisfaction.
The final whistle was greeted by ecstatic scenes at the Stade Rades and the result was a personal triumph for Tunisia coach Roger Lemerre, who led France to Euro 2000 glory - and was assistant coach when they won the 1998 World Cup on home soil - but was sacked after the 2002 World Cup.
The launch of the second stage the Rades port's docks expansion project with a total funding of around 300 million Tunisian dinars (MTD) was announced last Saturday by Fouad Othman, CEO of the Tunisian Company of Stevedoring and Handling (STAM), which manages the port of Rades, on the sidelines of the visit of the Minister of Transport to the main commercial port of Tunisia,