Dictionary![]() ![]() am•pi•cil•linPronunciation: (am"pu-sil'in), [key] —n. Pharm. a broad-spectrum semisynthetic penicillin, C16H19N3O4S, effective against certain susceptible Gram-positive and Gram-negative bacteria. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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