Dictionary
am•pi•cil•lin
Pronunciation: (am"pu-sil'in), [key]—
n. Pharm.
a broad-spectrum semisynthetic penicillin, C
16H
19N
3O
4S, effective against certain susceptible Gram-positive and Gram-negative bacteria.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.