bacterium

[ bak-teer-ee-uhm ]
/ bækˈtɪər i əm /

noun

singular of bacteria.

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Origin of bacterium

1840–50; <New Latin <Greek baktḗrion, diminutive of baktēría staff; akin to báktron stick, Latin baculum, bacillum
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for bacterium

British Dictionary definitions for bacterium

bacterium
/ (bækˈtɪərɪəm) /

noun

the singular of bacteria
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

Medical definitions for bacterium

bacterium
[ băk-tîrē-əm ]

n. pl. bac•te•ri•a (-tîrē-ə)

Any of the unicellular, prokaryotic microorganisms of the class Schizomycetes, which vary in terms of morphology, oxygen and nutritional requirements, and motility, and may be free-living, saprophytic, or pathogenic, the latter causing disease in plants or animals.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for bacterium

bacterium
[ băk-tîrē-əm ]

Plural bacteria

Any of a large group of one-celled organisms that lack a cell nucleus, reproduce by fission or by forming spores, and in some cases cause disease. They are the most abundant lifeforms on Earth, and are found in all living things and in all of the Earth's environments. Bacteria usually live off other organisms. Bacteria make up most of the kingdom of prokaryotes (Monera or Prokaryota), with one group (the archaea) sometimes classified as a separate kingdom. See also archaeon prokaryote.

Other words from bacterium

bacterial adjective
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.