Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† cătăpŏtĭum, ii, n., = καταπότιον (that which is swallowed down); in medicine, a pill, Cels. 4, 8; Plin. 28, 1, 2, § 7; Scrib. Comp. 89; cf. id. ib. 87.