raddest

rad

2 [rad]
noun
1.
Informal. radical.
adjective
2.
Slang. fine; wonderful.

Origin:
by shortening of radical

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World English Dictionary
rad1 (ræd)
 
n
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]

rad2
 
symbol for
radian

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Etymonline
Word Origin & History

rad
"x-ray dose unit," 1918, shortened form of radiation (q.v.). As shortened form of radical (n.), it is attested in political slang from 1820. Teen slang sense of "extraordinary, wonderful" is from late 1970s (see radical).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

rad 1 (rād)
n.
A unit of energy absorbed from ionizing radiation, equal to 100 ergs per gram or 0.01 joule per kilogram of irradiated material.

rad 2
abbr.
radian

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
rad   (rād)  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

rad definition


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

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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American Heritage
Abbreviations & Acronyms
rad
  1. radian

  2. radiation absorbed dose

  3. Slang radical (that is, excellent)

RAD
Royal Academy of Dancing
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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