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neo·my·cin | \ ˌnē-ə-ˈmī-sᵊn 
\
\Definition of neomycin
: a broad-spectrum highly toxic antibiotic or mixture of antibiotics produced by a streptomyces (Streptomyces fradiae) and used medically especially to treat local infections
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neomycin
nounneo·my·cin | \ ˌnē-ə-ˈmīs-ᵊn \
\Medical Definition of neomycin
: a broad-spectrum highly toxic mixture of aminoglycoside antibiotics produced by a bacterium of the genus Streptomyces (S. fradiae) specifically : a commercial preparation that is composed chiefly of two stereoisomers of neomycin administered in the form of their sulfate C23H46N6O13·2¹/₂H2SO4 and that is used either alone or in combination with one or more other drugs especially to treat infections (as impetigo or conjunctivitis) topically, to irrigate the bladder, and to produce intestinal antisepsis prior to certain surgeries
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The first known use of neomycin was in 1949
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