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Tympanum :: Tympanum (n.) A drum-shaped wheel with spirally curved partitions by which water is raised to the axis when the wheel revolves with the lower part of the circumference submerged, -- used for raising water, as for irrigation..

Vermetus :: Vermetus (n.) Any one of many species of marine gastropods belonging to Vermetus and allied genera, of the family Vermetidae. Their shells are regularly spiral when young, but later in life the whorls become separate, and the shell is often irregularly bent and contorted like a worm tube..

Trachelipoda :: Trachelipoda (n.pl.) An extensive artificial group of gastropods comprising all those which have a spiral shell and the foot attached to the base of the neck.

Gyration :: Gyration (n.) One of the whorls of a spiral univalve shell.

Sinistrorsal :: Sinistrorsal (a.) Rising spirally from right to left (of the spectator); sinistrorse.

Serpula :: Serpula (n.) Any one of numerous species of tubicolous annelids of the genus Serpula and allied genera of the family Serpulidae. They secrete a calcareous tube, which is usually irregularly contorted, but is sometimes spirally coiled. The worm has a wreath of plumelike and often bright-colored gills around its head, and usually an operculum to close the aperture of its tube when it retracts..

Spink :: Spinii-spirulate (a.) Having spines arranged spirally. See Spicule.

Twist :: Twist (n.) The spiral course of the rifling of a gun barrel or a cannon.

Thread :: Thread (n.) The prominent part of the spiral of a screw or nut; the rib. See Screw, n., 1..

Gastropoda :: Gastropoda (n. pl.) One of the classes of Mollusca, of great extent. It includes most of the marine spiral shells, and the land and fresh-water snails. They generally creep by means of a flat, muscular disk, or foot, on the ventral side of the body. The head usually bears one or two pairs of tentacles. See Mollusca..

Koodoo :: Koodoo (n.) A large South African antelope (Strepsiceros kudu). The males have graceful spiral horns, sometimes four feet long. The general color is reddish or grayish brown, with eight or nine white bands on each side, and a pale dorsal stripe. The old males become dark bluish gray, due to the skin showing through the hair. The females are hornless. Called also nellut..

Conveyor :: Conveyor (n.) A contrivance for carrying objects from place to place; esp., one for conveying grain, coal, etc., -- as a spiral or screw turning in a pipe or trough, an endless belt with buckets, or a truck running along a rope..

Nummulites :: Nummulites (n.) A genus of extinct Tertiary Foraminifera, having a thin, flat, round shell, containing a large number of small chambers arranged spirally..

Maclurea :: Maclurea (n.) A genus of spiral gastropod shells, often of large size, characteristic of the lower Silurian rocks..

Gyratory :: Gyratory (a.) Moving in a circle, or spirally; revolving; whirling around..

Voluted :: Voluted (a.) Having a volute, or spiral scroll..

Triseriate :: Triseriate (a.) Arranged in three vertical or spiral rows.

Whirlwind :: Whirlwind (n.) A violent windstorm of limited extent, as the tornado, characterized by an inward spiral motion of the air with an upward current in the center; a vortex of air. It usually has a rapid progressive motion..

Caracole :: Caracole (n.) A staircase in a spiral form.

Fauces :: Fauces (n.pl.) That portion of the interior of a spiral shell which can be seen by looking into the aperture.

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