any sedimentary rock, esp limestone, consisting of tiny spherical concentric grains within a fine matrix
WordReference Random House Unabridged Dictionary of American English © 2026
o•o•lite
(ō′ə līt′),USA pronunciation n. [Geol.]
o•o•lit•ic
(ō′ə lit′ik),USA pronunciation adj.
- Geologya limestone composed of minute rounded concretions resembling fish roe, in some places altered to ironstone by replacement with iron oxide. Also called egg stone.
- Neo-Latin oölithēs. See oo-, -lite
- French oölithe)
- 1775–85; (
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'oolite' also found in these entries (note: many are not synonyms or translations):