'microbial' definitions:

Definition of 'microbial'

From: WordNet
adjective
Of or involving or caused by or being microbes; "microbial warfare" [syn: microbial, microbic]

Definition of 'microbial'

From: GCIDE
  • microbial \mi*cro"bi*al\, microbian \mi*cro"bi*an\, a. (Biol.) Of, pertaining to, or caused by, microbes; as, microbial growth; the microbian theory; a microbian disease. [1913 Webster +PJC]