Entry 2 senses · 2 variants Webster, 1913 Cerite · Ce·rite · IPA /ˈsɪəɹaɪt/ n. n. 01 n. A gastropod shell belonging to the family Cerithiïdæ; -- so called from its hornlike form. 1. A gastropod shell belonging to the family Cerithiïdæ; -- so called from its hornlike form.(Zool.) 02 n. A mineral of a brownish of cherry-red color, commonly massive. It is a hydrous silicate of cerium and allied metals. 1. A mineral of a brownish of cherry-red color, commonly massive. It is a hydrous silicate of cerium and allied metals.(Min.)