Entry 2 senses · 2 variants Webster, 1913 Miliolite · Mil·i·o·lite · IPA n. a. 01 n. A fossil shell of, or similar to, the genus Miliola. 1. A fossil shell of, or similar to, the genus Miliola.(Paleon.) 02 a. The same Miliolitic. 1. The same Miliolitic. See: Miliolitic Phrases & compounds Miliolite limestone — a building stone, one of the group of the Paris basin, almost entirely made up of many-chambered microscopic shells.