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Meniscus :: Meniscus (n.) An interarticular synovial cartilage or membrane; esp., one of the intervertebral synovial disks in some parts of the vertebral column of birds..

Eccentric :: Eccentric (n.) A disk or wheel so arranged upon a shaft that the center of the wheel and that of the shaft do not coincide. It is used for operating valves in steam engines, and for other purposes. The motion derived is precisely that of a crank having the same throw..

Wheel :: Wheel (n.) A circular frame turning about an axis; a rotating disk, whether solid, or a frame composed of an outer rim, spokes or radii, and a central hub or nave, in which is inserted the axle, -- used for supporting and conveying vehicles, in machinery, and for various purposes; as, the wheel of a wagon, of a locomotive, of a mill, of a watch, etc..

Discal :: Discal (a.) Pertaining to, or resembling, a disk; as, discal cells..

Cadrans :: Cadrans (n.) An instrument with a graduated disk by means of which the angles of gems are measured in the process of cutting and polishing.

Tethys :: Tethys (n.) A genus of a large naked mollusks having a very large, broad, fringed cephalic disk, and branched dorsal gills. Some of the species become a foot long and are brilliantly colored..

Disk :: Disk (n.) A discus; a quoit.

Nimbus :: Nimbus (n.) A circle, or disk, or any indication of radiant light around the heads of divinities, saints, and sovereigns, upon medals, pictures, etc.; a halo. See Aureola, and Glory, n., 5..

Rondle :: Rondle (n.) A round mass, plate, or disk; especially (Metal.), the crust or scale which forms upon the surface of molten metal in the crucible..

Target :: Target (n.) A conspicuous disk attached to a switch lever to show its position, or for use as a signal..

Tristoma :: Tristoma (n.) Any one of numerous species of trematode worms belonging to Tristoma and allied genera having a large posterior sucker and two small anterior ones. They usually have broad, thin, and disklike bodies, and are parasite on the gills and skin of fishes..

Phase :: Phase (n.) A particular appearance or state in a regularly recurring cycle of changes with respect to quantity of illumination or form of enlightened disk; as, the phases of the moon or planets. See Illust. under Moon..

Peritricha :: Peritricha (n. pl.) A division of ciliated Infusoria having a circle of cilia around the oral disk and sometimes another around the body. It includes the vorticellas. See Vorticella.

Daisy :: Daisy (n.) A genus of low herbs (Bellis), belonging to the family Compositae. The common English and classical daisy is B. prennis, which has a yellow disk and white or pinkish rays..

Discina :: Discina (n.) A genus of Branchiopoda, having a disklike shell, attached by one valve, which is perforated by the peduncle..

Palm :: Palm (n.) A metallic disk, attached to a strap, and worn the palm of the hand, -- used to push the needle through the canvas, in sewing sails, etc..

Umbra :: Umbra (n.) The conical shadow projected from a planet or satellite, on the side opposite to the sun, within which a spectator could see no portion of the sun's disk; -- used in contradistinction from penumbra. See Penumbra..

Porpita :: Porpita (n.) A genus of bright-colored Siphonophora found floating in the warmer parts of the ocean. The individuals are round and disk-shaped, with a large zooid in the center of the under side, surrounded by smaller nutritive and reproductive zooids, and by slender dactylozooids near the margin. The disk contains a central float, or pneumatocyst..

Half-moon :: Half-moon (n.) The moon at the quarters, when half its disk appears illuminated..

Phenakistoscope :: Phenakistoscope (n.) A revolving disk on which figures drawn in different relative attitudes are seen successively, so as to produce the appearance of an object in actual motion, as an animal leaping, etc., in consequence of the persistence of the successive visual impressions of the retina. It is often arranged so that the figures may be projected upon a screen..

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