ulcerate(adjective, verb) adjective1. (palynology, of a pollen grain) Having an ulcus, a rounded pore-like aperture, at one or both poles. verb1. undergo ulceration- Her stomach ulceratedDefinition categories: change2. affect with an ulcer- Her stomach was ulceratedDefinition categories: body, affectSentences with ulcerate as a verb:- The surface was ulcerated by trauma.- The tissue ulcerated shortly after exposure.