Main definitions of rad in English

: rad1rad2rad3rad4rad5

rad1

  • Radian(s).

Pronunciation:

rad

/rad/

Main definitions of rad in English

: rad1rad2rad3rad4rad5

rad2

noun

informal
  • A political radical.

    • ‘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.

Pronunciation:

rad

/rad/

Main definitions of rad in English

: rad1rad2rad3rad4rad5

rad3

noun

Physics
  • A unit of absorbed dose of ionizing radiation, corresponding to the absorption of 0.01 joule per kilogram of absorbing material.

    • ‘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.’
    • ‘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 LD50 dose for humans is ~ 400 rads, so we may infer that the environment of Amalthea is such that an unshielded human would receive a fatal amount of ionizing radiation in a matter of seconds.’
    • ‘Ten rads per hour is several orders of magnitude more than a nuclear warhead would emit.’

Origin

Early 20th century: acronym from radiation absorbed dose.

Pronunciation:

rad

/rad/

Main definitions of rad in English

: rad1rad2rad3rad4rad5

rad4

adjective

North American
informal
  • Excellent; impressive:

    ‘his style is so rad’
    ‘a really rad game’
    • ‘We would be super hyped, if we could find a rad label to distribute and promote our music.’
    • ‘Hey kids, looking for something rad to do this winter that doesn't cost a lot of money?’
    • ‘He told me it was rad and that a friend of his snagged him one before it came out.’
    • ‘What's with that rad Marc Jacobs shirt, with the scribbly skulls and slept-in appearance?’
    • ‘But that's okay, if I only get onto the Quebec team that will be pretty rad too.’
    • ‘And Stacy hooked me up with some rad wallpaper today.’
    • ‘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.’
    • ‘Go look for yourself at the site were you can download a sample trailer, with some rad action from the world cups.’
    • ‘Issue 20 brings you tons of rad photos and articles.’
    • ‘And get ready to carve ice, to rock the terrain and be, like, totally rad.’
    • ‘When I stop bouncing, I think to myself, ‘Wow, that was rad.’’
    • ‘I remember how I'd sit in class back in grade school, drawing rad pictures of the Grim Reaper sweeping down and stealing the souls of all he touched.’
    • ‘We started to think the way we did when we were in high school about how rad it would be to be in a touring band.’
    • ‘We saw the Lichtenstein exhibit which was rad, and the Glamour exhibit which was kinda whack.’
    • ‘I feel incredibly lucky to be in such a rad work environment with a most excellent group of people.’
    • ‘The video was all over the internet, too, and was equally rad.’
    • ‘I'm standing in the garage of a supercool geek guy who is building an obscure, rad, retro sportscar.’
    • ‘We hang together, go to the same school and think rock 'n' roll is rad.’
    • ‘You have a rad apartment in Manhattan where space is a privilege, not a right.’
    • ‘I've only heard the first side, but it's pretty rad.’
    excellent, wonderful, marvellous, magnificent, superb, splendid, glorious, sublime, lovely, delightful, first-class, first-rate, outstanding
    View synonyms

Origin

1980s: probably an abbreviation of radical.

Pronunciation:

rad

/rad/

Main definitions of rad in English

: rad1rad2rad3rad4rad5

rad5

noun

  • short for radiator
    • ‘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.’
    • ‘We carried spare water for the rad, a hand pump just in case the Dunlop pressure dropped, and maybe even a canister of petrol.’

Pronunciation:

rad

/rad/

Main definitions of rad in English

: rad1rad2rad3rad4rad5

RAD

  • (in the UK) Royal Academy of Dance.

Pronunciation:

RAD

/rad/