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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Clypeate :: Clypeate (a.) Furnished with a shield, or a protective plate or shell..

Blade :: Blade (n.) The four large shell plates on the sides, and the five large ones of the middle, of the carapace of the sea turtle, which yield the best tortoise shell..

Ostracoidea :: Ostracoidea (n. pl.) An order of Entomostraca possessing hard bivalve shells. They are of small size, and swim freely about..

Lingula :: Lingula (n.) Any one of numerous species of brachiopod shells belonging to the genus Lingula, and related genera. See Brachiopoda, and Illustration in Appendix..

Tellina :: Tellina (n.) A genus of marine bivalve mollusks having thin, delicate, and often handsomely colored shells..

Ammunition :: Ammunition (n.) Articles used in charging firearms and ordnance of all kinds; as powder, balls, shot, shells, percussion caps, rockets, etc..

Nodosarine :: Nodosarine (a.) Resembling in form or structure a foraminiferous shell of the genus Nodosaria.

Siphonostome :: Siphonostome (n.) A siphonostomatous shell.

Umbo :: Umbo (n.) One of the lateral prominence just above the hinge of a bivalve shell.

Multicostate :: Multicostate (a.) Having numerous ribs, or costae, as the leaf of a plant, or as certain shells and corals..

Conch :: Conch (n.) In works of art, the shell used by Tritons as a trumpet..

Wedge-shell :: Wedge-shell (n.) Any one of numerous species of small marine bivalves belonging to Donax and allied genera in which the shell is wedge-shaped.

Dolium :: Dolium (n.) A genus of large univalve mollusks, including the partridge shell and tun shells..

Spatangoidea :: Spatangoidea (n. pl.) An order of irregular sea urchins, usually having a more or less heart-shaped shell with four or five petal-like ambulacra above. The mouth is edentulous and situated anteriorly, on the under side..

Thecosomata :: Thecosomata (n. pl.) An order of Pteropoda comprising those species which have a shell. See Pteropoda.

Testudinated :: Testudinated (a.) Resembling a tortoise shell in appearance or structure; roofed; arched; vaulted.

Foliated :: Foliated (a.) Having leaves, or leaflike projections; as, a foliated shell..

Fig-shell :: Fig-shell (n.) A marine univalve shell of the genus Pyrula, or Ficula, resembling a fig in form..

Shealing :: Shealing (n.) The outer husk, pod, or shell, as of oats, pease, etc.; sheal; shell..

Tripoli :: Tripoli (n.) An earthy substance originally brought from Tripoli, used in polishing stones and metals. It consists almost wholly of the siliceous shells of diatoms..