<p><strong>Noun</strong></p><ul><li>any of several edible, marine, bivalve mollusks of the family Ostreidae, having an irregularly shaped shell, occurring on the bottom or adhering to rocks or other objects in shallow water</li><li>the oyster-shaped bit of dark meat in the front hollow of the side bone of a fowl</li><li>Slang. a closemouthed or uncommunicative person, especially one who keeps secrets well</li><li>something from which a person may extract or derive advantage: The world is my oyster</li><li>oyster white</li></ul><p><strong>Verb</strong></p><ul><li>(used without object) to dredge for or otherwise take oysters</li></ul>