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say it: rad
rad is a noun meaning "a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material". It carries 2 recorded senses.
a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material
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)
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for rad come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.