microbal

Adjective

microbial (not comparable)

1. Of, relating to, or caused by microbes or microorganisms.
   • The close analogies between DNA-containing eukaryotic cell organelles and microbial symbionts require revision of classic cell theory, wrote Scwemmler and Schenk (1980) on introducing the field of endocytobiology.1991, Lynn Margulis, René Fester, Symbiosis as a Source of Evolutionary Innovation
2. Small; tiny; minuscule.
   • As I say, one must not blame the Christians too much for all this - partly because, after the communal periods which I have just mentioned, Christianity was evidently deeply influenced by the rise of Commercialism to which during the last two centuries it has so carefully and piously adapted...1920, Edward Carpenter, Pagan and Christian Creeds, New York: Harcourt, Brace and Co., published 1921, page 191

See all 3 meanings of microbial