rad

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material
noun the unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees)

Rad callum medicine man now." — Tom Swift and His Giant Telescope, Victor Appleton
617 Rad = hasty, rash. — The Story of Genesis and Exodus: An Early English Song, about 1250 A.D., Unknown
“‘Then I must get some from old Rad;’ and he rose to go aft. — Moby Dick; Or, The Whale, Herman Melville

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