ˌstreptəˈnīgrə̇n noun
( -s )
Etymology: New Latin strepto- (from Streptomyces flocculus , actinomycete from which it is produced) + Latin nigr-, niger black + English -in ; probably from its dark color
: a toxic antibiotic C 25 H 22 N 4 O 8 from an actinomycete of the genus Streptomyces ( S. flocculus ) that interferes with DNA metabolism and is used as an antineoplastic agent