tobramycin
[ toh-bruh-mahy-sin ]
/ ˌtoʊ brəˈmaɪ sɪn /
noun Pharmacology.
a highly toxic aminoglycoside antibiotic, C18H37N5O9, derived from Streptomyces tenebarius, used in the treatment of serious infections due to susceptible Gram-positive and Gram-negative organisms.