oyster

noun

oys·​ter ˈȯi-stər 

often attributive

1

a

: any of various marine bivalve mollusks (family Ostreidae) that have a rough irregular shell closed by a single adductor muscle and include commercially important shellfish

b

: any of various mollusks resembling or related to the oysters

2

: something that is or can be readily made to serve one's personal ends

the world was her oyster

3

: a small mass of muscle contained in a concavity of the pelvic bone on each side of the back of a fowl

4

: an extremely taciturn person

5

: a grayish-white color

Examples of oyster in a Sentence

Recent Examples on the Web

Sashimi with a trio of sauces — coconut-lime, yuzu-tamari and pomegranate-orange — joins oysters and shrimp cocktail as seafood selections. —Heidi Finley, Charlotte Observer, 28 May 2026

Regulars indulge their bistro swagger with oysters on the half shell, foie gras torchon with fig-pear marmalade, cheese souffle, brown butter skate wing, and a proper steak au poivre. —Claudia Alarcón, Forbes.com, 28 May 2026

Starters include Norfolk Bay oysters and kingfish sashimi, while mains spotlight Tasmanian beef from premium producers like Cape Grim, Robbins Island, and King Island, with the option to add Southern rock lobster. —Condé Nast, Condé Nast Traveler, 27 May 2026

Bivalve fans should check out Shuckers, an old-school oyster bar with lots of gorgeous dark wood. —Harry Cheadle, Bon Appetit Magazine, 27 May 2026

Word History

Etymology

Middle English oistre, borrowed from Anglo-French oistre, ostre, going back to Latin ostrea, ostreum "bivalve mollusk, oyster," borrowed from Greek óstreion, óstreon, of uncertain origin

Note: Greek óstreion has traditionally been taken to be a derivative, with a suffix -ei-, of a stem going back to Indo-European *h₃esth₁-r-, from the base *h₃esth₁- "bone." See note at ostracon.

First Known Use

13th century, in the meaning defined at sense 1a

Phrases Containing oyster

• European flat oyster
• European oyster
• Olympia oyster
• oyster bed
• oyster crab
• oyster cracker
• oyster drill
• oyster mushroom
• oyster plant
• seed oyster
• the world is someone's oyster
• vegetable oyster

Rhymes for oyster

• cloister
• moister
• royster

Kids Definition

oyster

noun

oys·​ter ˈȯi-stər 

: any of various marine mollusks that include important edible shellfish and have a rough uneven shell made up of two hinged parts and closed by a single muscle