ul·cer·ate \-əˌrāt, usu -ād.+V\verb (-ed/-ing/-s) Etymology: Middle English ulceraten, from Latin ulceratus, past participle of ulcerare to ulcerate, from ulcer-, ulcus ulcer transitive verb : to affect with or as if with an ulcer < an ulcerated stomach > intransitive verb : to undergo ulceration