n.
Pronunciation: ˌ äk-s ə - ' si-l ə n
Function: noun
Etymology: ox- + a zole + peni cillin
Date: 1962
: a semisynthetic penicillin administered in the form of its hydrated sodium salt C 19 H 18 N 3 NaO 5 S·H 2 O to treat infections caused by penicillin-resistant staphylococci