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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Turnip-shell :: Turnip-shell (n.) Any one of several large, thick, spiral marine shells belonging to Rapa and allied genera, somewhat turnip-shaped..

Chelonia :: Chelonia (n. pl.) An order of reptiles, including the tortoises and turtles, peculiar in having a part of the vertebrae, ribs, and sternum united with the dermal plates so as to form a firm shell. The jaws are covered by a horny beak. See Reptilia; also, Illust. in Appendix..

Mactra :: Mactra (n.) Any marine bivalve shell of the genus Mactra, and allied genera. Many species are known. Some of them are used as food, as Mactra stultorum, of Europe. See Surf clam, under Surf..

Half-deck :: Half-deck (n.) A shell of the genus Crepidula; a boat shell. See Boat shell.

Dodman :: Dodman (n.) Any shellfish which casts its shell, as a lobster..

Toothshell :: Toothshell (n.) Any species of Dentalium and allied genera having a tooth-shaped shell. See Dentalium.

Purple :: Purple (n.) Any shell of the genus Purpura.

Truncated :: Truncated (a.) Lacking the apex; -- said of certain spiral shells in which the apex naturally drops off.

Mytilus :: Mytilus (n.) A genus of marine bivalve shells, including the common mussel. See Illust. under Byssus..

Turbinated :: Turbinated (a.) Spiral with the whorls decreasing rapidly from a large base to a pointed apex; -- said of certain shells.

Pelagian :: Pelagian (a.) Of or pertaining to the sea; marine; pelagic; as, pelagian shells..

Ianthina :: Ianthina (n.) Any gastropod of the genus Ianthina, of which various species are found living in mid ocean; -- called also purple shell, and violet snail..

Undulated :: Undulated (a.) Formed with elevations and depressions resembling waves; having wavelike color markings; as, an undulated shell..

Faluns :: Faluns (n.) A series of strata, of the Middle Tertiary period, of France, abounding in shells, and used by Lyell as the type of his Miocene subdivision..

Protoconch :: Protoconch (n.) The embryonic shell, or first chamber, of ammonites and other cephalopods..

Ioqua Shell :: Ioqua shell () The shell of a large Dentalium (D. pretiosum), formerly used as shell money, and for ornaments, by the Indians of the west coast of North America..

Eye :: Eye (n.) The scar to which the adductor muscle is attached in oysters and other bivalve shells; also, the adductor muscle itself, esp. when used as food, as in the scallop..

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

Dolabriform :: Dolabriform (a.) Shaped like the head of an ax or hatchet, as some leaves, and also certain organs of some shellfish..

Reprimer :: Reprimer (n.) A machine or implement for applying fresh primers to spent cartridge shells, so that the shells be used again..