noun Pharmacology.
a highly toxic broad-spectrum antibiotic mixture of related aminoglycoside substances derived from the actinomycete bacterium Micromonospora purpurea, used in its sulfate form in the treatment of severe Gram-negative infections.

1963; respelling of gentamycin, probably equivalent to gent(ian violet) + -a- (as in kanamycin) + -mycin; so called from the color of the source bacterium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gentamicin (ˌdʒɛntəˈmaɪsɪn)
a broad-spectrum antibiotic used in the treatment of serious infections
[C20: from genta (of unknown origin) + -mycin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

gentamicin gen·ta·mi·cin or gen·ta·my·cin (jěn'tə-mī'sĭn)
A broad-spectrum antibiotic derived from an actinomycete used in the treatment of various infections.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Once daily gentamicin treatment has been tried with excellent results as an alternative therapy to streptomycin.
Placing an antibiotic called gentamicin directly into the middle ear can help control vertigo.
Both can be treated with gentamicin, one of a larger group of antibiotics called aminoglycosides.
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