/i rith'reuh muy"sin/ , n.
Pharm. an antibiotic, C 37 H 67 NO 13 , produced by an actinomycete, Streptomyces erythraeus, used chiefly in the treatment of diseases caused by many Gram-positive and some Gram-negative organisms.
[ 1950-55; ERYTHRO- + -MYCIN ]