from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A small calcium carbonate or iron coated grain found on the seafloor.
- adj. Shaped like an egg; ovoid; ovate.
Those conditions are most often found in shoals, sandbanks that create shallow water; Joulters Cay is one of the rare ooid beaches, and Andros Island pictured above has Pleistocene-epoch oolitic deposits.
The ooid beaches of the Bahamas are comprised of rare grains of "sand."