Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Armŏsăta (Arsamŏsăta, Tac. A. 15, 10; Plin. l. l.), ae, f., = Ἀρμόσατα Polyb., Ἀρσαμόσατα Ptol., a fortress in Armenia, Plin. 6, 9, 10, § 26.