bac·te·ri·a

[bak-teer-ee-uh]
plural noun, singular bac·te·ri·um [bak-teer-ee-uhm] .
ubiquitous one-celled organisms, spherical, spiral, or rod-shaped and appearing singly or in chains, comprising the Schizomycota, a phylum of the kingdom Monera (in some classification systems the plant class Schizomycetes), various species of which are involved in fermentation, putrefaction, infectious diseases, or nitrogen fixation.

Origin:
1905–10; < Neo-Latin < Greek baktḗria, plural of baktḗrion; see bacterium

bac·te·ri·al, adjective
bac·te·ri·al·ly, adverb
non·bac·te·ri·al, adjective
non·bac·te·ri·al·ly, adverb
un·bac·te·ri·al, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To bacterial
00:10
Bacterial is always a great word to know.
So is gobo. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Collins
World English Dictionary
bacteria (bækˈtɪərɪə) [Click for IPA pronunciation guide]
 
pl n , sing -rium
See also prokaryote a very large group of microorganisms comprising one of the three domains of living organisms. They are prokaryotic, unicellular, and either free-living in soil or water or parasites of plants or animals
 
[C19: plural of New Latin bacterium, from Greek baktērion, literally: a little stick, from baktron rod, staff]
 
bac'terial
 
adj
 
bac'terially
 
adv

bacteria (bækˈtɪərɪə) [Click for IPA pronunciation guide]
 
pl n , sing -rium
See also prokaryote a very large group of microorganisms comprising one of the three domains of living organisms. They are prokaryotic, unicellular, and either free-living in soil or water or parasites of plants or animals
 
[C19: plural of New Latin bacterium, from Greek baktērion, literally: a little stick, from baktron rod, staff]
 
bac'terial
 
adj
 
bac'terially
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Etymonline
Word Origin & History

bacteria
1847, from Mod.L. pl. of bacterium, from Gk. bakterion "small staff," dim. of baktron "stick, rod," from PIE *bak- "staff used for support." So called because the first ones observed were rod-shaped. Introduced as a scientific word 1838 by Ger. naturalist Christian Gottfried Ehrenberg (1795-1876). Related:
Bacterial (1871).
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
American Heritage
Medical Dictionary

bacteria bac·te·ri·a (bāk-tǐr'ē-ə)
n.
Plural of bacterium.


bac·te'ri·al adj.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
American Heritage
Science Dictionary
bacteria   (bāk-tîr'ē-ə)  Pronunciation Key 
Plural of bacterium.
bacterium   (bāk-tîr'ē-əm)  Pronunciation Key 
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 or archaebacteria) often classified as a separate kingdom. See also archaeon, prokaryote.

bacterial adjective
Our Living Language  : It is important to remember that bacteria is the plural of bacterium, and that saying a bacteria is incorrect. It is correct to say The soil sample contains millions of bacteria, and Tetanus is caused by a bacterium.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
American Heritage
Cultural Dictionary

bacteria definition


sing. bacterium

Microorganisms made up of a single cell that has no distinct nucleus. Bacteria reproduce by fission or by forming spores.

Note: Some bacteria are beneficial to humans (for example, those that live in the stomach and aid digestion), and some are harmful (for example, those that cause disease).
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Example sentences
Sepsis is caused by a bacterial infection that can begin anywhere in the body.
The researchers investigated the honey's activities versus three bacterial
  species that commonly infect wounds.
Empty bacterial cells can deliver key anti-tumor substances with high
  precision, new research suggests.
Human serum destroyed only eight of the bacterial strains.
Copyright © 2013 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature
FAVORITES
RECENT