Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† āĕtītēs, ae, f., = ἀετίτης (from ἀετός, eagle), a stone found in the nest of the eagle, eagle-stone, to us unknown, Plin. 10, 3, 4, § 12; 30, 14, 44, § 130.