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View synonyms for rad

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 for

Mathematics.
  1. radian; radians.

rad.

4

abbreviation for

Mathematics.
  1. radical.
  2. radix.

rad.

1

abbreviation for

  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

2

/ ræd /

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

3

symbol for

  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

/ răd /

  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 2for 1; 1975–80 rad 2for 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

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

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.

He says “rad” without irony and gets away with it.

She even got down and did some pretty rad splits on this long-forgotten sad carpet.

“It’s been pretty rad being able to go up and snowboard in the morning, go out and fish in the afternoon, then go stare at waterfalls for the sunset,” he said.

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