any of a group of viruses that infect specific bacteria, usually causing their disintegration or dissolution.
Also called phage.

1920–25; < French bactériophage. See bacterio-, -phage

bacteriophagic [bak-teer-ee-uh-faj-ik, -fey-jik] , bacteriophagous [bak-teer-ee-of-uh-guhs] , adjective
bacteriophagy [bak-teer-ee-of-uh-jee] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bacteriophage (bækˈtɪərɪəˌfeɪdʒ)
Often shortened to: phage a virus that is parasitic in a bacterium and multiplies within its host, which is destroyed when the new viruses are released

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

1921, from Fr. bactériophage (1917), from bacterio-, comb. form of bacteria + -phage (see -phagous).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

bacteriophage bac·te·ri·o·phage (bāk-tēr'ē-ə-fāj')
A virus capbale of infecting and lysing bacterial cells. Also called phage.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
bacteriophage   (bāk-tîr'ē-ə-fāj')  Pronunciation Key 
A virus that infects and destroys bacterial cells.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The trick begins with a type of virus called a bacteriophage.
After some incubation, different organs were taken, and bacteriophage were recovered from them.
Scientists genetically engineered a bacteriophage-a virus that infects bacteria but is harmless to humans.
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