cephalexin

ceph·a·lex·in

noun \ˌsef-ə-ˈlek-sən\

Definition of CEPHALEXIN

: a semisynthetic cephalosporin C₁₆H₁₇N₃O₄S with a spectrum of antibiotic activity similar to the penicillins that is often administered in the form of its hydrochloride C₁₆H₁₇N₃O₄S·HCl