Main definitions of rad in English

: rad1rad2rad3rad4

rad1

  • Radian(s)

Pronunciation:

rad

/rad/

Main definitions of rad in English

: rad1rad2rad3rad4

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

: rad1rad2rad3rad4

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.’
    • ‘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.’
    • ‘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 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

: rad1rad2rad3rad4

rad4

adjective

North American
informal
  • Excellent; impressive.

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