Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sĕcespĭta, ae, f. [seco], a long iron sacrificial knife, Suet. Tib. 25 fin.; cf. Fest. pp. 348 and 349 Müll.; Serv. Verg. A. 4, 262.