Dictionary
ceph•a•lex•in
Pronunciation: (sef"u-lek'sin), [key]—
n. Pharm.
an oral, antimicrobial drug, C
16H
7N
3O
4S, used in treating minor respiratory and urinary tract infections and as a backup or alternative to penicillin treatment.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.