strep·to·thri·cin 
(strĕp′tə-thrīsĭn, -thrĭsĭn)
(strĕp′tə-thrīsĭn, -thrĭsĭn)n.
Any of a group of antibiotics produced by an actinomycete (Streptomyces lavendulae) and active against both gram-positive and gram-negative bacteria and some fungi.
[New Latin Streptothrix, Streptothric-, former genus name of the actinomycete producing it (STREPTO- + Greek thrix, trikh-, hair) + -IN.]