oolite

n. [ Gr. w, 'o`n an egg + -lite: cf. F. ooithe. So named from its resemblance to the roe of fish. ] (Geol.) A variety of limestone, consisting of small round grains, resembling the roe of a fish. It sometimes constitutes extensive beds, as in the European Jurassic. See the Chart of Geology. [ 1913 Webster ]