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Block :: Block (v. t.) A grooved pulley or sheave incased in a frame or shell which is provided with a hook, eye, or strap, by which it may be attached to an object. It is used to change the direction of motion, as in raising a heavy object that can not be conveniently reached, and also, when two or more such sheaves are compounded, to change the rate of motion, or to exert increased force; -- used especially in the rigging of ships, and in tackles..

Gizzard :: Gizzard (n.) A stomach armed with chitinous or shelly plates or teeth, as in certain insects and mollusks..

Siphonostomatous :: Siphonostomatous (a.) Having the front edge of the aperture of the shell prolonged in the shape of a channel for the protection of the siphon; -- said of certain gastropods.

Brachiopod :: Brachiopod (n.) One of the Brachiopoda, or its shell..

Cuttle Bone :: Cuttle bone () The shell or bone of cuttlefishes, used for various purposes, as for making polishing powder, etc..

Eggshell :: Eggshell (n.) A smooth, white, marine, gastropod shell of the genus Ovulum, resembling an egg in form..

Scaphopda :: Scaphopda (n. pl.) A class of marine cephalate Mollusca having a tubular shell open at both ends, a pointed or spadelike foot for burrowing, and many long, slender, prehensile oral tentacles. It includes Dentalium, or the tooth shells, and other similar shells. Called also Prosopocephala, and Solenoconcha..

Shill :: Shill (v. t.) To shell.

Betel :: Betel (n.) A species of pepper (Piper betle), the leaves of which are chewed, with the areca or betel nut and a little shell lime, by the inhabitants of the East Indies. It is a woody climber with ovate many-nerved leaves..

Scalaria :: Scalaria (n.) Any one of numerous species of marine gastropods of the genus Scalaria, or family Scalaridae, having elongated spiral turreted shells, with rounded whorls, usually crossed by ribs or varices. The color is generally white or pale. Called also ladder shell, and wentletrap. See Ptenoglossa, and Wentletrap..

Epiphragm :: Epiphragm (n.) A membranaceous or calcareous septum with which some mollusks close the aperture of the shell during the time of hibernation, or aestivation..

Neomenoidea :: Neomenoidea (n. pl.) A division of vermiform gastropod mollusks, without a shell, belonging to the Isopleura..

Soft-shell :: Soft-shell (a.) Alt. of Soft-shelle.

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

Tulip-shell :: Tulip-shell (n.) A large, handsomely colored, marine univalve shell (Fasciolaria tulipa) native of the Southern United States. The name is sometimes applied also to other species of Fasciolaria..

Muschelkalk :: Muschelkalk (n.) A kind of shell limestone, whose strata form the middle one of the three divisions of the Triassic formation in Germany. See Chart, under Geology..

Frustule :: Frustule (n.) The siliceous shell of a diatom. It is composed of two valves, one overlapping the other, like a pill box and its cover..

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..

Prop :: Prop (n.) A shell, used as a die. See Props..

Fossil :: Fossil (a.) Like or pertaining to fossils; contained in rocks, whether petrified or not; as, fossil plants, shells..

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