Definition of mesalazine in US English:

mesalazine

noun

Pharmacology
  • An isomer of aminosalicylic acid, used especially as an alternative to sulphasalazine in the treatment of inflammatory bowel disease; 5-amino-2 salicylic acid, C₂H₇NO₃.

Origin

1980s; earliest use found in British Approved Names 1981. Origin uncertain; apparently from me- (perhaps alteration of amino-) + sal- + azine.