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View synonyms for

rad

1

[rad]

noun

Physics.
  1. a unit of absorbed dose of radiation equal to 0.01 gray: not a standard SI unit, the rad is still used, especially in the U.S., but it is increasingly disfavored.



rad

2

[rad]

noun

  1. Informal.a radical, especially a person with extreme views on political and social issues.

adjective

radder, raddest 
  1. Slang.excellent; wonderful; cool.

    a high speed, high energy, totally rad racing game.

rad

3

[rad]

abbreviation

Mathematics.
  1. radian; radians.

rad.

4

abbreviation

Mathematics.
  1. radical.

  2. radix.

rad

1

/ æ /

noun

  1. 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

“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

rad

2

symbol

  1. radian

“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

rad.

3

abbreviation

  1. radical

  2. 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

rad

  1. 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.

rad

  1. An acronym for r adiation a bsorbed d ose. A unit of energy absorbed from ionizing radiation.

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Word History and Origins

Origin of rad1

First recorded in 1915–20; r(adiation) a(bsorbed) d(ose)

Origin of rad2

First recorded in 1820–25 rad 2 for 1; 1975–80 rad 2 for 2; shortening of radical

Origin of rad3

First recorded in 1910–15; shortening
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Word History and Origins

Origin of rad1

C20: shortened from radiation
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Example Sentences

Examples have not been reviewed.

Hahn: This woman had been working with Marvel and “Agatha,” and so she was kind of sent my way, and then I kept working with her, and she’s rad.

From

No doubt “dropping in” and “chasing stoke” for eternity would be “rad.”

From

It’s just a rad place to be in.

From

So if I could sleep in until 9 a.m. or 9:30 a.m., that would be rad.

From

Here are three potential itineraries for three different kinds of rad dads: those who love the great outdoors, fall head over heels for food and dig the arts.

From

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racyRADA