Hypertext Webster Gateway: "radioactivity"
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) 1.7 (wn)
radioactivity
n : radiation resulting from radioactive decay [syn: {activity}]
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