Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. capsa, ae, f. [capio; Fr. caisse; Engl. case], a repository, box, esp. for books, bookcase, satchel, * Cic. Div. in Caecil. 16, 51; Hor. S. 1, 4, 22; 1, 10, 63; id. Ep. 2, 1, 268; Juv. 10, 117; also for fruit, Plin. 15, 17, 18, § 65; 15, 19, 21, § 82; Mart. 11, 8.