The Collaborative International Dictionary of English v.0.48:
Microbic \Mi*crob"ic\, a. (Biol.) Of or pertaining to a microbe. [1913 Webster]WordNet (r) 3.0 (2006):
microbic adj 1: of or involving or caused by or being microbes; "microbial warfare" [syn: microbial, microbic]