Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ā̆crēdŭla, ae, f., the name of an unknown bird, by which Cic. translates the ὀλολυγών of Aratus, Div. 1, 8, 14; acc. to some, the thrush or the owl, Auct. Carm. Phil. 15.