2 definitions found
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Radio-active \Ra`di*o-ac"tive\, a. [Radio- + active.] (Physics)
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.
From WordNet r 1.6 [wn]:
radioactive
adj : exhibiting or caused by radioactivity; "radioactive
isotope"; "radioactive decay"; "radioactive fallout"
[ant: {nonradioactive}]
more about radioactive
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