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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..

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..

Helical :: Helical (a.) Of or pertaining to, or in the form of, a helix; spiral; as, a helical staircase; a helical spring..

Ionic :: Ionic (a.) Pertaining to the Ionic order of architecture, one of the three orders invented by the Greeks, and one of the five recognized by the Italian writers of the sixteenth century. Its distinguishing feature is a capital with spiral volutes. See Illust. of Capital..

Spired :: Spire (n.) The part of a spiral generated in one revolution of the straight line about the pole. See Spiral, n..

Heterodromous :: Heterodromous (a.) Having spirals of changing direction.

Creeper :: Creeper (n.) Any device for causing material to move steadily from one part of a machine to another, as an apron in a carding machine, or an inner spiral in a grain screen..

Turbinated :: Turbinated (a.) Spiral with the whorls decreasing rapidly from a large base to a pointed apex; -- said of certain shells.

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

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

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

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

Paucispiral :: Paucispiral (a.) Having few spirals, or whorls; as, a paucispiral operculum or shell..

Twist :: Twist (v. t.) To contort; to writhe; to complicate; to crook spirally; to convolve.

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

Wreathy :: Wreathy (a.) Wreathed; twisted; curled; spiral; also, full of wreaths..

Tube :: Tube (n.) A more or less cylindrical, and often spiral, case secreted or constructed by many annelids, crustaceans, insects, and other animals, for protection or concealment. See Illust. of Tubeworm..

Stentor :: Stentor (n.) Any species of ciliated Infusoria belonging to the genus Stentor and allied genera, common in fresh water. The stentors have a bell-shaped, or cornucopia-like, body with a circle of cilia around the spiral terminal disk. See Illust. under Heterotricha..

Reversed :: Reversed (a.) Turned side for side, or end for end; changed to the contrary; specifically (Bot. & Zool.), sinistrorse or sinistral; as, a reversed, or sinistral, spiral or shell..

Rifle :: Rifle (n.) A gun, the inside of whose barrel is grooved with spiral channels, thus giving the ball a rotary motion and insuring greater accuracy of fire. As a military firearm it has superseded the musket..

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