bivalve

1 of 2

adjective

bi·​valve ˈbī-ˌvalv 

: being or having a shell composed of two valves

bivalve

2 of 2

noun

: any of a class (Bivalvia synonym Pelecypoda) of typically marine mollusks (such as clams, oysters, or scallops) that have a 2-valved hinged shell, are usually filter feeders, and lack a distinct head

Examples of bivalve in a Sentence

Noun

clams, mussels, oysters, and other bivalves

Recent Examples on the Web

Adjective

Eating raw or partially cooked shellfish—specifically bivalve shellfish like clams, geoducks, mussels, scallops, and oysters—can cause norovirus if the shellfish is contaminated. —Jenna Anderson, Health, 19 Dec. 2024

The town’s big, bivalve-themed bash, Wellfleet Oyster Fest, happens annually on the weekend after Columbus Day (Oct. 19 and 20 this year) along Main Street. —BostonGlobe.com, 10 Oct. 2019

Noun

Between the lines: With a whopping 2 million oysters sold annually, CRG routinely tests its bivalves for bacteria in an independent lab — a measure that costs the company tens of thousands of dollars a year, but also ensures a clean and safe product. —Anna Spiegel, Axios, 19 Nov. 2024

Experts weigh in on how to prepare these beloved bivalves. —Heather Riske, Better Homes & Gardens, 5 Dec. 2024

Word History

First Known Use

Adjective

1661, in the meaning defined above

Noun

1683, in the meaning defined above

Kids Definition

bivalve

1 of 2 adjective

bi·​valve ˈbī-ˌvalv 

: having or being a shell composed of two movable valves

a bivalve mollusk

bivalve

2 of 2 noun

: any of a class of typically marine mollusks (as clams, oysters, and scallops) that have a shell made up of two parts joined by a hinge, are usually filter feeders, and lack a distinct head

Medical Definition

bivalve

1 of 2 adjective

bi·​valve ˈbī-ˌvalv 

variants also bivalved

-ˌvalvd 

: having or consisting of two corresponding movable pieces suggesting the shells of mollusks

a bivalve speculum

a bivalve cast

bivalve

2 of 2 transitive verb

bivalved; bivalving

: to split (a cast) along one or two sides (as to relieve pressure)