Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Caesēna, ae, f., a town in Gallia Cispadana, now Cesena, Cic. Fam. 16, 27, 2, Plin. 3, 15, 20, § 116.
Hence, Caesēnas, ātis, adj., of Cœsena: vina, Plin. 14, 6, 8, § 67.