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- (noun): A non-SI unit of absorbed dose of radiation, equal to 0.01 gray.
- (noun): In the International System of Units, the derived unit of plane angular measure of angle equal to the angle subtended at the centre of a circle by an arc of its circumference equal in length to the radius of the circle. Symbol: rad
- (noun): Anything which radiates or emits rays.
- (noun): A device that lowers engine coolant temperature by conducting heat to the air, through metal fins.
- (noun): (of buildings) A finned metal fixture that carries hot water or steam in order to heat a room.
- (noun): A type of antenna.
- (adjective): Favoring fundamental change, or change at the root cause of a matter.
- (adjective): Pertaining to a root (of a plant).
- (adjective): Pertaining to the basic or intrinsic nature of something.
- (adjective): Thoroughgoing; far-reaching.
- (adjective): Of or pertaining to the root of a word.
- (adjective): (of a sound) Produced using the root of the tongue.
- (adjective): Involving free radicals.
- (adjective): Relating to a radix or mathematical root.
- (adjective): (1980s & 1990s) Excellent; awesome.
- (noun): The distance between the front and rear sights of a firearm.
- His beliefs are radical.
- The spread of the cancer required radical surgery, and the entire organ was removed.
- a radical quantity; a radical sign
- That was a radical jump!