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
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.
A word brought back to life by a couple of high school kids in 2003 during third hour, which is rapidly growing in popularity.
Joey: "Dude, we should seriousley start saying rad"
Alex: "I second that motion"
by nello killer March 26, 2005
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.

by Missus Jackie Gleason May 12, 2008
Something that requires the use of skills, usually of a physical persuasion with some element of danger involved.

Also used to describe sexual intercourse or getting drunk.

"Hey man, do you want to go get rad on some steep hills?"
"Yeh, me and her got rad last night"
"Man, lets get rad tonight at the club"
by maxisrad August 16, 2007
abbreviation of radiator.
the rad isn't working! i'm fecking freezing.
by kellykellyrob April 14, 2007
rad- short for radical, which meant cool, a term that is still used today by a populace of individuals that never really grew out of the 80's scene and still believe that other terms are cool such as "hey dude" or worse "dudette" and even "totally." Beware of these individuals for they are probably still sporting a Madonna or Micheal Jackson glove on one hand with the fingers cut out of it, watching movies such as Pretty in Pink or The Breakfast Club, and own a very colorful collection of wrist or ankle warmers.
Everyone laughed at her when Jane called Bob's new car rad.
by blueeyes811 May 05, 2006
Possibly the most over-used word in the hardcore/emo scene. Used as kudos towards someone/something.
"Hey, rad black jeans, maybe I should get a pair."
"The way you did your hair looks rad!"
by Heathxcore February 06, 2006

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