RADIOACTIVE

radioactive

(adjective) exhibiting or caused by radioactivity; “radioactive isotope”; “radioactive decay”; “radioactive fallout”

Source: WordNet® 3.1

Etymology

Adjective

radioactive (not comparable)

Exhibiting radioactivity.

(figurative, rare) Dangerous and disgusting, particularly of people or ideas.

Noun

radioactive (plural radioactives)

Any radioactive substance.

Source: Wiktionary

Ra`di*o-ac"tive, a. [Radio-+ active.] (Physics)

Definition: Capable of luminescence under the action of cathode rays, X rays, or any of the allied forms of radiation. -- Ra`di*o- ac*tiv"i*ty, n.

Source: Webster’s Unabridged Dictionary 1913 Edition

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