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Shell :: Shell (n.) Hence, by extension, any mollusks having such a covering..

Concave :: Concave (a.) Hollow and curved or rounded; vaulted; -- said of the interior of a curved surface or line, as of the curve of the of the inner surface of an eggshell, in opposition to convex; as, a concave mirror; the concave arch of the sky..

Shell :: Shell (v. t.) To separate the kernels of (an ear of Indian corn, wheat, oats, etc.) from the cob, ear, or husk..

Perforata :: Perforata (n. pl.) A division of Foraminifera, including those having perforated shells..

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..

Include :: Include (v. t.) To confine within; to hold; to contain; to shut up; to inclose; as, the shell of a nut includes the kernel; a pearl is included in a shell..

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

Interdome :: Interdome (n.) The open space between the inner and outer shells of a dome or cupola of masonry.

Buckler :: Buckler (n.) The anterior segment of the shell of trilobites.

Chip :: Chip (v. t.) To break or crack, or crack off a portion of, as of an eggshell in hatching, or a piece of crockery..

Olive :: Olive (n.) Any shell of the genus Oliva and allied genera; -- so called from the form. See Oliva.

Petalism :: Petalism (n.) A form of sentence among the ancient Syracusans by which they banished for five years a citizen suspected of having dangerous influence or ambition. It was similar to the ostracism in Athens; but olive leaves were used instead of shells for ballots.

Extractor :: Extractor (n.) A device for withdrawing a cartridge or spent cartridge shell from the chamber of the barrel.

Diaphragm :: Diaphragm (n.) A calcareous plate which divides the cavity of certain shells into two parts.

Kitchen Middens :: Kitchen middens () Relics of neolithic man found on the coast of Denmark, consisting of shell mounds, some of which are ten feet high, one thousand feet long, and two hundred feet wide. The name is applied also to similar mounds found on the American coast from Canada to Florida, made by the North American Indians..

Rhachiglossa :: Rhachiglossa (n. pl.) A division of marine gastropods having a retractile proboscis and three longitudinal rows of teeth on the radula. It includes many of the large ornamental shells, as the miters, murices, olives, purpuras, volutes, and whelks. See Illust. in Append..

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..

Papboat :: Papboat (n.) A large spiral East Indian marine shell (Turbinella rapha); -- so called because used by native priests to hold the oil for anointing.

Beak :: Beak (n.) The upper or projecting part of the shell, near the hinge of a bivalve..

Shell :: 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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