Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
‡ 1. sĕdum = sed; v. sed. init.
2. sĕdum, i, n., houseleek (called also aizoon, or digitellum), Plin. 18, 17, 45, § 159; Col. 2, 9, 10; 2, 10, 356; 11, 3, 61 sq.; Pall. Sept. 3, 2.