微生物学
Microbiology \Mi`cro*bi*ol"o*gy\, n. [See {Microbe}; {-logy}.] The study of minute organisms, or microbes, as the bacteria. -- {Mi`cro*bi`o*log"ic*al}, a. -- {Mi`cro*bi*ol"o*gist}, n.
microbiology n : the branch of biology that studies microorganisms and their effects on humans