Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
caepīna (cēp-), ae (caepuila, ae, Pall. Febr. 24, 2; id. Oct. 11, 4), f. [caepa; anal. to napina, porrina. rapina; lit., adj., sc. planta], a field or bed of onions, Col. 11, 3, 56 sq.