Search Result for "radioactive": 
Wordnet 3.0

ADJECTIVE (1)

1. exhibiting or caused by radioactivity;
- Example: "radioactive isotope"
- Example: "radioactive decay"
- Example: "radioactive fallout"


The Collaborative International Dictionary of English v.0.48:

radioactive \ra`di*o*ac"tive\ (r[=a]`d[i^]*[-o]*[a^]k"t[i^]v), a. [Radio- + active.] 1. (Physics) Capable of luminescence under the action of cathode rays, X rays, or any of the allied forms of radiation. [obsolete] [Webster 1913 Suppl.] 2. (Physics) of, exhibiting, or caused by radioactivity. [PJC]
WordNet (r) 3.0 (2006):

radioactive adj 1: exhibiting or caused by radioactivity; "radioactive isotope"; "radioactive decay"; "radioactive fallout" [ant: nonradioactive]