noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   An acetoxymethyl ester of benzylpenicillin; a prodrug that is processed to benzylpenicillin by esterases. uncountable

Etymology

From (redundant) penam + -cillin (“6-aminopenicillanic acid derivative”).

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.