There are 6 main definitions of rad in English:

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rad1

Line breaks: rad

abbreviation

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There are 6 main definitions of rad in English:

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rad2

Line breaks: rad

noun

informal
A political radical.
Example sentences
  • Like many university students in those early days of the Whitlam government, I saw myself as a bit of a rad.

Origin

early 19th century: abbreviation.

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There are 6 main definitions of rad in English:

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rad3

Line breaks: rad

noun

Physics
A unit of absorbed dose of ionizing radiation, corresponding to the absorption of 0.01 joule per kilogram of absorbing material.
Example sentences
  • The dose equivalent in rems is numerically equal to the absorbed dose in rads multiplied by the quality factor, which, for most medical radiation, is one.
  • The radiation dosage was 5000 rads, similar to what has been used for other domestic species.
  • For example, ordinary first responders are instructed not to enter an affected area to save someone's life if they would accumulate a dose of 25 rads of radiation.

Origin

early 20th century: acronym from radiation absorbed dose.

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rad4

Line breaks: rad

adjective

informal , chiefly North American
Excellent; impressive: his style is so rad a really rad game
More example sentences
  • The video was all over the internet, too, and was equally rad.
  • I feel incredibly lucky to be in such a rad work environment with a most excellent group of people.
  • I've skated with a lot of pro skaters and come across lots of rad style, but the best style I've ever witness in my life was this guy, I think his name was Ryan.

Origin

1980s: probably an abbreviation of radical.

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There are 6 main definitions of rad in English:

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rad5

Line breaks: rad

noun

Short for radiator.
Example sentences
  • We carried spare water for the rad, a hand pump just in case the Dunlop pressure dropped, and maybe even a canister of petrol.
  • Take care when taking the rad off its wall - brackets.
  • I can always put off doing the woodwork and rad until a later date, although I'd like to get it done fairly soon.

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