/toh'breuh muy"sin/ , n. Pharm.
a highly toxic aminoglycoside antibiotic, C 18 H 37 N 5 O 9 , derived from Streptomyces tenebarius, used in the treatment of serious infections due to susceptible Gram-positive and Gram-negative organisms.
[ 1970-75; perh. ( Strep ) to ( myces ) ( tene ) bra ( rias ) + -MYCIN ]