Spiral

Definition of Spiral

Spi´ral
a.1.Winding or circling round a center or pole and gradually receding from it; as, the spiral curve of a watch spring.
2.Winding round a cylinder or imaginary axis, and at the same time rising or advancing forward; winding like the thread of a screw; helical.
3.(Geom.) Of or pertaining to a spiral; like a spiral.
Spiral gear
(Mach.) a gear resembling in general a spur gear, but having its teeth cut at an angle with its axis, or so that they form small portions of screws or spirals.
Spiral gearing
a kind of gearing sometimes used in light machinery, in which spiral gears, instead of bevel gears, are used to transmit motion between shafts that are not parallel.
Spiral operculum
an operculum whih has spiral lines of growth.
Spiral shell
any shell in which the whorls form a spiral or helix.
Spiral spring
See the Note under Spring, n., 4.
n.1.(Geom.) A plane curve, not reëntrant, described by a point, called the generatrix, moving along a straight line according to a mathematical law, while the line is revolving about a fixed point called the pole. Cf. Helix.
2.Anything which has a spiral form, as a spiral shell.
Equiangular spiral
a plane curve which cuts all its generatrices at the same angle. Same as Logarithmic spiral, under Logarithmic.
Spiral of Archimedes
a spiral the law of which is that the generatrix moves uniformly along the revolving line, which also moves uniformly.

Related Words

Milky Way, O-shaped, Via Lactea, acrobatics, aerobatics, ambagious, anfractuous, arise, ascend, aspire, backhanded, bank, banking, barred spiral, barred spiral galaxy, become airborne, chandelle, circle, circling, circuit, circuiteer, circuition, circuitous, circuitousness, circuitry, circular, circularity, circulate, circulation, circumambience, circumambiency, circumambulate, circumambulation, circumflexion, circumlocution, circummigrate, circummigration, circumnavigate, circumnavigation, circumvent, cirrus, claw skyward, close the circle, cochlear, cochleate, coil, coiled, come full circle, come up, compass, corkscrew, corkscrewy, cosmic noise, crab, crabbing, curl, curl upwards, curlicue, cycle, describe a circle, deviance, deviancy, deviating, deviation, deviative, devious, deviousness, digression, digressive, dip, discursive, dive, diving, encircle, encompass, entwine, evolute, excursion, excursive, excursus, feather, fishtail, fishtailing, flank, float, fly, fly aloft, gain altitude, galactic circle, galactic cluster, galactic coordinates, galactic latitude, galactic longitude, galactic nebula, galactic noise, galactic pole, galaxy, girdle, girdle the globe, glide, go about, go around, go round, go the round, go up, grow up, gyre, gyring, hang, helical, helicoid, helix, hover, indirect, indirection, involute, island universe, kink, kite, lap, leave the ground, levitate, loom, loop, make a circuit, meandering, mount, nose dive, oblique, orbit, orbital, orbiting, out-of-the-way, plane, plow, poise, porpoise, power dive, pull out, pull up, pull-up, pullout, push down, pushdown, rear, rear up, revolve, ringlet, rise, rise up, roll, rolling, rotary, round, roundabout, roundaboutness, rounding, screw, screw-shaped, scroll, scrolled, sideslip, skid, skirt, soar, spheroidal galaxy, spin, spiral galaxy, spiral nebula, spiraling, spire, spiroid, stall, stand up, stunt, stunting, supergalaxy, surge, surround, swarm up, sweep up, swirl, tactical maneuvers, take off, tendril, tower, turbinal, turbinate, turn, turning, twine, twirl, twist, undulate, up, upgo, upgrow, upheave, uprise, upspin, upstream, upsurge, upswarm, upwind, verticillate, volplane, volute, voluted, volution, vortex, wheel, wheeling, whirl, whorl, whorled, wreathe, yaw, zoom
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Spinous
Spinous process of a vertebra
Spinozism
Spinozist
Spinster
Spinstress
Spinstry
Spinthariscope
Spinule
Spinulescent
Spinulose
Spiny
Spiny lobster
Spiny rat
Spiodea
Spirable
Spiracle
Spiracular
Spiraea
Spiraeic
-Spiral-
Spiral axis
Spiral gear
Spiral gearing
Spiral of Archimedes
Spiral operculum
Spiral shell
Spiral spring
Spirality
Spirally
Spiralozooid
Spirant
Spiranthy
Spiration
Spire
Spire bearer
Spired
Spiricle
Spirifer
Spirillum
Spiring
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