abbreviation of radiator.
the rad isn't working! i'm fecking freezing.
by kellykellyrob April 14, 2007

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Short for "radical," it's a word that needs to come back. Often used in conjunction with dude.
Dude, I can't believe that you memorized the periodic table. That's a totally rad waste of time.
by Quam Celerrime August 06, 2008

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A cooler way of saying somthing is awesome. Coming from snowboard and skate roots.
generikal.com is so ill its rad!
by generikal.com April 27, 2003

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awesome,wonderful but could be risky
(After a motorbike ride) That was so rad!
by gaur August 16, 2012

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n: a unit of measurement used to describe a dose of radiation. A single rad is equivalent to 100 ergs per gram or 0.01 joules per kilogram of irradiated substance.
The Federally-defined maximum occupational radiation dose is 5 rads per year.
by Ten Second Tom September 29, 2005

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Rapid application development. Used to describe programming languages such as visual basic that speed up development time.
By the time I wrote a game engine in C++, the game was finished in Visual Basic.

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Another way to say "high"
Phil- Hey bill, did I tell you about the party last night?

Bill- Phil, I was AT that party last night

Phil- Well fuck... I was really fucking rad last night...

Bill- yeah.... you were Phil...
by Charlietoes August 22, 2009

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1. (n) Friends =O
2. (adj) To be exceedingly cool.
OMG DUDE!your friends are frikken rad!

HAHA That Erin Kid Is RAD!
by KAYLEEEEEEEEENN January 11, 2008

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