Entry 1 sense Webster, 1913 abortus /(ȧ*bôrt"ŭs)/ · a·bort·us · IPA /əˈbɔɹ.təs/ 01 n. a fetus which has been aborted; same as abortion{2}. 1. a fetus which has been aborted; same as abortion{2}. See: abortion{2}