[ oi-ster ]
See synonyms for: oysteroysters on Thesaurus.com

  1. 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.

  2. the oyster-shaped bit of dark meat in the front hollow of the side bone of a fowl.

  1. Slang. a closemouthed or uncommunicative person, especially one who keeps secrets well.

  2. something from which a person may extract or derive advantage: The world is my oyster.

verb (used without object)
  1. to dredge for or otherwise take oysters.

Origin of oyster

1325–75; Middle English oistre<Middle French <Latin ostrea<Greek óstreon;see ostracize

Words Nearby oyster

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use oyster in a sentence

British Dictionary definitions for oyster


/ (ˈɔɪstə) /

    • any edible marine bivalve mollusc of the genus Ostrea, having a rough irregularly shaped shell and occurring on the sea bed, mostly in coastal waters

    • (as modifier): oyster farm; oyster knife

  1. any of various similar and related molluscs, such as the pearl oyster and the saddle oyster (Anomia ephippium)

  1. the oyster-shaped piece of dark meat in the hollow of the pelvic bone of a fowl

  2. something from which advantage, delight, profit, etc, may be derived: the world is his oyster

  3. informal a very uncommunicative person

  1. (intr) to dredge for, gather, or raise oysters

Origin of oyster

C14 oistre, from Old French uistre, from Latin ostrea, from Greek ostreon; related to Greek osteon bone, ostrakon shell

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Idioms and Phrases with oyster


see world is one's oyster.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.