tropical ulcer noun1 •A chronic ulcerative skin lesion, common in tropical climates, thought to be caused by polymicrobial infection by various microorganisms, including mycobacteria.He stifled a scream with a strange gulp as he splashed water over the tropical ulcer the size of a teacup on his leg, and consoled himself that keeping this wound clean was a good thing. — 2013 formstropical ulcers