Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sēbum (sēvum; cf. the letter B; and Freund ad Cic. Mil. p. 34), i, n., tallow, suet, grease (syn.: adeps, pingue), Plaut. Capt. 2, 2, 31; Col. 7, 5, 13; Plin. 11, 37, 85, § 212; Pall. 1, 41, 3; Veg. 4, 1, 8; Ser. Samm. 41, 763.