English definition of Shell

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Definition of shell

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Shell (n.) The hard calcareous or chitinous external covering of mollusks, crustaceans, and some other invertebrates. In some mollusks, as the cuttlefishes, it is internal, or concealed by the mantle. Also, the hard covering of some vertebrates, as the armadillo, the tortoise, and the like..

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Corona :: Corona (n.) The shelly skeleton of a sea urchin.

Shell :: Shell (n.) A coarse kind of coffin; also, a thin interior coffin inclosed in a more substantial one..

Fissurella :: Fissurella (n.) A genus of marine gastropod mollusks, having a conical or limpetlike shell, with an opening at the apex; -- called also keyhole limpet..

Discoid :: Discoid (n.) Anything having the form of a discus or disk; particularly, a discoid shell..

Operculum :: Operculum (n.) Any lid-shaped structure closing the aperture of a tube or shell.

Cannonade :: Cannonade (n.) The act of discharging cannon and throwing ball, shell, etc., for the purpose of destroying an army, or battering a town, ship, or fort; -- usually, an attack of some continuance..

Orbulina :: Orbulina (n.) A genus of minute living Foraminifera having a globular shell.

Varix :: Varix (n.) One of the prominent ridges or ribs extending across each of the whorls of certain univalve shells.

Crag :: Crag (n.) A partially compacted bed of gravel mixed with shells, of the Tertiary age..

Shell-lac :: Shell-lac (n.) Alt. of Shella.

Testicardines :: Testicardines (n. pl.) A division of brachiopods including those which have a calcareous shell furnished with a hinge and hinge teeth. Terebratula and Spirifer are examples.

Conchoidal :: Conchoidal (a.) Having elevations or depressions in form like one half of a bivalve shell; -- applied principally to a surface produced by fracture.

Discina :: Discina (n.) A genus of Branchiopoda, having a disklike shell, attached by one valve, which is perforated by the peduncle..

Valve :: Valve (n.) One of the two similar portions of the shell of a diatom.

Exogyra :: Exogyra (n.) A genus of Cretaceous fossil shells allied to oysters.

Orthid :: Orthid (n.) A brachiopod shell of the genus Orthis, and allied genera, of the family Orthidae..

Maara Shell :: Maara shell () A large, pearly, spiral, marine shell (Turbo margaritaceus), from the Pacific Islands. It is used as an ornament..

Shrapnel :: Shrapnel (n.) A shrapnel shell; shrapnel shells, collectively..

Subumbrella :: Subumbonal (a.) Beneath or forward of the umbos of a bivalve shell.

Cingulum :: Cingulum (n.) A distinct girdle or band of color; a raised spiral line as seen on certain univalve shells.