noun Geology.
- a limestone composed of minute rounded concretions resembling fish roe, in some places altered to ironstone by replacement with iron oxide.
noun
- any sedimentary rock, esp limestone, consisting of tiny spherical concentric grains within a fine matrix
n.“rock consisting of fine grains of carbonate of lime,” 1785, from Modern Latin oolites, from oo-, comb. form of Greek oon “egg” (cognate with Old English æg, see egg (n.)) + lithos “stone” (see litho-). So called because the rock resembles the roe of fish.
- A sedimentary rock consisting of ooliths that are cemented together by calcium carbonate.