Medical Definition of monensin
: an antibiotic C36H62O11 obtained from a bacterium of the genus Streptomyces (S. cinnamonensis) and used as an antiprotozoal, antibacterial, and antifungal agent and as an additive to cattle feed
Seen and Heard
What made you want to look up monensin? Please tell us where you read or heard it (including the quote, if possible).