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
definately the new word fer "cool"... so much cooler than cool
you: you're rad
me: thanks... i am quite rad
by josprettyrad August 22, 2006
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
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
abbreviation of radiator.
the rad isn't working! i'm fecking freezing.
by kellykellyrob April 14, 2007
A popular misconception by the 21st century kids that "rad" is short for "radical", whilst it can be, it is more popular with ex-hippies from the original counterculture of the sixties to stand for "rock and drugs", ergo, rad. Though, it can still be used in context as, "that party was really rad," but therefore implying that there was rock and drugs at the party.
L: What ever happen to just plain sex, drugs, n rock n roll?
B: I don't really know why they left the 's' out, I guess you could say rads.

Rads.
by Missus Jackie Gleason May 12, 2008
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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