Meaning
In the International System of Units, the derived unit of plane angle: the angle subtended at the centre of a circle by an arc of its circumference equal in length to the radius of the circle.
Etymology
Origin: Middle English
Etymology tree Latin radiusbor. English radius Proto-Indo-European *-nós Proto-Italic *-nos Proto-Italic *-ānos Latin -ānus Old French -ainder. Middle English -an English -an English radian From radius + -an.
Synonyms & Antonyms
Synonyms
rad
NYT Puzzle Appearances
Accepted in 10 recorded puzzles: