Definition of spiral

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Spiraeic (a.) Of, pertaining to, or derived from, the meadowsweet (Spiraea); formerly, designating an acid which is now called salicylic acid..

Lern More About Spiral

Chank :: Chank (n.) The East Indian name for the large spiral shell of several species of sea conch much used in making bangles, esp. Turbinella pyrum. Called also chank chell..
Sinistral :: Sinistral (a.) Having the whorls of the spire revolving or rising to the left; reversed; -- said of certain spiral shells.
Twist :: Twist (n.) The spiral course of the rifling of a gun barrel or a cannon.
Gyroidal :: Gyroidal (a.) Having the planes arranged spirally, so that they incline all to the right (or left) of a vertical line; -- said of certain hemihedral forms..
Gyroidal :: Gyroidal (a.) Turning the plane of polarization circularly or spirally to the right or left.
Gyration :: Gyration (n.) One of the whorls of a spiral univalve shell.
Maclurea :: Maclurea (n.) A genus of spiral gastropod shells, often of large size, characteristic of the lower Silurian rocks..
Helicine :: Helicine (a.) Curled; spiral; helicoid; -- applied esp. to certain arteries of the penis.
Pampre :: Pampre (n.) An ornament, composed of vine leaves and bunches of grapes, used for decorating spiral columns..
Twining :: Twining (a.) The act of one who, or that which, twines; (Bot.) the act of climbing spirally..
Auger :: Auger (n.) A carpenter's tool for boring holes larger than those bored by a gimlet. It has a handle placed crosswise by which it is turned with both hands. A pod auger is one with a straight channel or groove, like the half of a bean pod. A screw auger has a twisted blade, by the spiral groove of which the chips are discharge..
Ganoidei :: Ganoidei (n. pl.) One of the subclasses of fishes. They have an arterial cone and bulb, spiral intestinal valve, and the optic nerves united by a chiasma. Many of the species are covered with bony plates, or with ganoid scales; others have cycloid scales..
Screw :: Screw (n.) Specifically, a kind of nail with a spiral thread and a head with a nick to receive the end of the screw-driver. Screws are much used to hold together pieces of wood or to fasten something; -- called also wood screws, and screw nails. See also Screw bolt, below..
Hydractinian :: Hydractinian (n.) Any species or marine hydroids, of the genus Hydractinia and allied genera. These hydroids form, by their rootstalks, a firm, chitinous coating on shells and stones, and esp. on spiral shells occupied by hermit crabs. See Illust. of Athecata..
Tracheid :: Tracheid (n.) A wood cell with spiral or other markings and closed throughout, as in pine wood..
Volute :: Volute (n.) A spiral turn, as in certain shells..
Helical :: Helical (a.) Of or pertaining to, or in the form of, a helix; spiral; as, a helical staircase; a helical spring..
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..
Suspiration :: Suspiral (n.) A spring of water passing under ground toward a cistern or conduit.
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..
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