A political radical.
- ‘Like many university students in those early days of the Whitlam government, I saw myself as a bit of a rad.’
Early 19th century: abbreviation.
A unit of absorbed dose of ionizing radiation, corresponding to the absorption of 0.01 joule per kilogram of absorbing material.
- ‘Ten rads per hour is several orders of magnitude more than a nuclear warhead would emit.’
- ‘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.’
Early 20th century: acronym from radiation absorbed dose.
Excellent; impressive.‘his style is so rad’‘a really rad game’
excellent, wonderful, marvellous, magnificent, superb, splendid, glorious, sublime, lovely, delightful, first-class, first-rate, outstandingView synonyms
- ‘I've only heard the first side, but it's pretty rad.’
- ‘We hang together, go to the same school and think rock 'n' roll is 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.’
- ‘We saw the Lichtenstein exhibit which was rad, and the Glamour exhibit which was kinda whack.’
- ‘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.’
- ‘The video was all over the internet, too, and was equally rad.’
- ‘When I stop bouncing, I think to myself, ‘Wow, that was rad.’’
- ‘Issue 20 brings you tons of rad photos and articles.’
- ‘Hey kids, looking for something rad to do this winter that doesn't cost a lot of money?’
- ‘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.’
- ‘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 feel incredibly lucky to be in such a rad work environment with a most excellent group of people.’
- ‘He told me it was rad and that a friend of his snagged him one before it came out.’
- ‘Go look for yourself at the site were you can download a sample trailer, with some rad action from the world cups.’
- ‘You have a rad apartment in Manhattan where space is a privilege, not a right.’
- ‘I'm standing in the garage of a supercool geek guy who is building an obscure, rad, retro sportscar.’
- ‘We would be super hyped, if we could find a rad label to distribute and promote our music.’
- ‘And get ready to carve ice, to rock the terrain and be, like, totally rad.’
1980s: probably an abbreviation of radical.