Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Tānā̆gra, ae, f., = Τάναγρα, a town of Bœotia, now Grimadha, Cic. Dom. 43, 111; Plin. 4, 7, 12, § 26; Liv. 33, 28; 35, 51.
Hence,