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  1. the branch of biology dealing with the structure, function, uses, and modes of existence of microscopic organisms.

Origin of microbiology

First recorded in 1885–90; micro- + biology
Related formsmi·cro·bi·o·log·i·cal [mahy-kroh-bahy-uh-loj-i-kuh l] /ˌmaɪ kroʊˌbaɪ əˈlɒdʒ ɪ kəl/, mi·cro·bi·o·log·ic, adjectivemi·cro·bi·o·log·i·cal·ly, adverbmi·cro·bi·ol·o·gist, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for microbiology

Contemporary Examples

Historical Examples

  • In fact, I am assured that nothing exists which gives anything like so full a study of microbiology.

British Dictionary definitions for microbiology


  1. the branch of biology involving the study of microorganisms
Derived Formsmicrobiological (ˌmaɪkrəʊˌbaɪəˈlɒdʒɪkəl) or microbiologic, adjectivemicrobiologically, adverbmicrobiologist, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for microbiology


1880, coined in English from micro- + biology. Related: Microbiological.

Online Etymology Dictionary, © 2010 Douglas Harper

microbiology in Medicine


  1. The branch of biology that deals with microorganisms and their effects on other living organisms.
Related formsmi′cro•bi′o•logic (-ə-lŏgĭk) adj.mi′cro•bi•olo•gist n.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

microbiology in Science


  1. The scientific study of microorganisms.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.