Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
exĭtĭo, ōnis, f. [exeo], a going or coming out (ante-class. and late Lat.): ex utero, Plaut. Truc. 2, 6, 30: a Deo, Hilar. Trin. 6, 31.