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Scutibranchiata :: Scutibranchiata (n. pl.) An order of gastropod Mollusca having a heart with two auricles and one ventricle. The shell may be either spiral or shieldlike.

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..

Spire :: Spire (n.) A spiral; a curl; a whorl; a twist.

Fusee :: Fusee (n.) The cone or conical wheel of a watch or clock, designed to equalize the power of the mainspring by having the chain from the barrel which contains the spring wind in a spiral groove on the surface of the cone in such a manner that the diameter of the cone at the point where the chain acts may correspond with the degree of tension of the spring..

Nautilus :: Nautilus (n.) The only existing genus of tetrabranchiate cephalopods. About four species are found living in the tropical Pacific, but many other species are found fossil. The shell is spiral, symmetrical, and chambered, or divided into several cavities by simple curved partitions, which are traversed and connected together by a continuous and nearly central tube or siphuncle. See Tetrabranchiata..

Parastichy :: Parastichy (n.) A secondary spiral in phyllotaxy, as one of the evident spirals in a pine cone..

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..

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

Worm :: Worm (n.) A spiral instrument or screw, often like a double corkscrew, used for drawing balls from firearms..

Trachea :: Trachea (n.) One of the large cells in woody tissue which have spiral, annular, or other markings, and are connected longitudinally so as to form continuous ducts..

Spirillum :: Spirifer (n.) Any one of numerous species of fossil brachipods of the genus Spirifer, or Delthyris, and allied genera, in which the long calcareous supports of the arms form a large spiral, or helix, on each side..

Helix :: Helix (n.) A nonplane curve whose tangents are all equally inclined to a given plane. The common helix is the curve formed by the thread of the ordinary screw. It is distinguished from the spiral, all the convolutions of which are in the plane..

Antidromous :: Antidromous (a.) Changing the direction in the spiral sequence of leaves on a stem.

Vessel :: Vessel (n.) A continuous tube formed from superposed large cylindrical or prismatic cells (tracheae), which have lost their intervening partitions, and are usually marked with dots, pits, rings, or spirals by internal deposition of secondary membranes; a duct..

Suspiration :: Suspiral (n.) A spring of water passing under ground toward a cistern or conduit.

Multispiral :: Multispiral (a.) Having numerous spiral coils round a center or nucleus; -- said of the opercula of certain shells.

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..

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..

Cochlea :: Cochlea (n.) An appendage of the labyrinth of the internal ear, which is elongated and coiled into a spiral in mammals. See Ear..

Curl :: Curl (v. i.) To contract or bend into curls or ringlets, as hair; to grow in curls or spirals, as a vine; to be crinkled or contorted; to have a curly appearance; as, leaves lie curled on the ground..

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