microbiology

The definition of microbiology is the branch of biology that studies micro-organisms (very small organisms).

(noun)

The study of immune systems is an example of microbiology.

See microbiology in Webster's New World College Dictionary

noun

the branch of biology that deals with microorganisms

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See microbiology in American Heritage Dictionary 4

noun

The branch of biology that deals with microorganisms and their effects on other living organisms.

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