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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Shell :: Shell (v. i.) To fall off, as a shell, crust, etc..

Placophora :: Placophora (n. pl.) A division of gastropod Mollusca, including the chitons. The back is covered by eight shelly plates. Called also Polyplacophora. See Illust. under Chiton, and Isopleura..

Replicated :: Replicated (a.) Folded over or backward; folded back upon itself; as, a replicate leaf or petal; a replicate margin of a shell..

Ootype :: Ootype (n.) The part of the oviduct of certain trematode worms in which the ova are completed and furnished with a shell.

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

Picking :: Picking (n.) The pulverized shells of oysters used in making walks.

Nautiloid :: Nautiloid (a.) Like or pertaining to the nautilus; shaped like a nautilus shell.

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

Pyrula :: Pyrula (n.) A genus of large marine gastropods. having a pear-shaped shell. It includes the fig-shells. See Illust. in Appendix.

Pichiciago :: Pichiciago (n.) A small, burrowing, South American edentate (Chlamyphorus truncatus), allied to the armadillos. The shell is attached only along the back..

Shellwork :: Shellwork (n.) Work composed of shells, or adorned with them..

Maroon :: Maroon (n.) An explosive shell. See Marron, 3..

Physa :: Physa (n.) A genus of fresh-water Pulmonifera, having reversed spiral shells. See Pond snail, under Pond..

Beard :: Beard (v. t.) To deprive of the gills; -- used only of oysters and similar shellfish.

Scaup :: Scaup (n.) A bed or stratum of shellfish; scalp.

Phragmocone :: Phragmocone (n.) The thin chambered shell attached to the anterior end of a belemnite.

Wentletrap :: Wentletrap (n.) Any one of numerous species of elegant, usually white, marine shells of the genus Scalaria, especially Scalaria pretiosa, which was formerly highly valued; -- called also staircase shell. See Scalaria..

Skimmer :: Skimmer (n.) Any one of several large bivalve shells, sometimes used for skimming milk, as the sea clams, and large scallops..

Shellproof :: Shellproof (a.) Capable of resisting bombs or other shells; bombproof.

Determination :: Determination (n.) The act of determining the relations of an object, as regards genus and species; the referring of minerals, plants, or animals, to the species to which they belong; classification; as, I am indebted to a friend for the determination of most of these shells..