gen·ta·mi·cin 
(jĕn′tə-mīsĭn)
(jĕn′tə-mīsĭn)n.
A broad-spectrum antibiotic derived from an actinomycete of the genus Micromonospora, used in its sulfate form to treat various infections.
[Alteration of gentamycin : GENT(I)A(N VIOLET) + -MYCIN.]