oyster

noun

oys·​ter ˈȯi-stər How to pronounce oyster (audio)
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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Here’s a recipe for Sandy Ho’s funky fresh oysters. Ryan Fonseca, Los Angeles Times, 2 Apr. 2025 Poke, oysters, lox and salmon roe are all ready-to-eat as well. Benjy Egel, Sacbee.com, 28 Mar. 2025 Complete with mollusks like clams, oysters, snails, and slugs, the model showed how various animals might’ve responded to the climate changes of 252 million years ago based on their modern relatives’ abilities to survive similar shifts in their environments. Sam Walters, Discover Magazine, 27 Mar. 2025 Paso Robles Wine Merchant In the mood for a cheese board or maybe some fresh Morro Bay oysters? Nicole Kliest, Vogue, 24 Mar. 2025 See All Example Sentences for oyster

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

Time Traveler
The first known use of oyster was in the 13th century

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Cite this Entry

“Oyster.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/oyster. Accessed 10 Apr. 2025.

Kids Definition

oyster

noun
oys·​ter ˈȯi-stər How to pronounce oyster (audio)
: 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

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