Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
trĕpondo, neutr. indecl. [tres-pondus; cf. duapondo, under duo], three pounds: ejusdem radicis trepondo, panacis pondo IV., Scrib. Comp. 165: adipis porcinae, id. ib. 271; cf. Quint. 1, 5, 15.