The Collaborative International Dictionary of English v.0.48:

carcinogenic \car`cin*o*gen"ic\
   (k[aum]r`s[i^]n*[-o]*j[e^]n"[i^]k), adj.
   Causing or tending to cause cancer; as, the carcinogenic
   action of certain chemicals or of ionizing radiation. --
   car`cin*o*gen*ic"i*ty, n.
   [WordNet 1.5 +PJC]