Cycloid scale(Zoöl.), a fish scale which is thin and shows concentric lines of growth, without serrations on the margin.

(Cy"cloid), n. (Zoöl.) One of the Cycloidei.

(Cy*cloid"al) a. Pertaining to, or resembling, a cycloid; as, the cycloidal space is the space contained between a cycloid and its base.

Cycloidal engine. See Geometric lathe.

(||Cy*cloi"de*i) n. pl. [NL., fr. Gr. ky`klos circle + - oid.] (Zoöl.) An order of fishes, formerly proposed by Agassiz, for those with thin, smooth scales, destitute of marginal spines, as the herring and salmon. The group is now regarded as artificial.

(Cy*cloid"i*an) a. & n. (Zoöl.) Same as 2d and 3d Cycloid.

(Cy*clom"e*ter) n. [Cyclo- + -meter.] A contrivance for recording the revolutions of a wheel, as of a bicycle.

(Cy*clom"e*try) n. [Cyclo- + -metry: cf. F. cyclométrie.] (Geom.) The art of measuring circles.

(Cy"clone) n. [Gr. moving in a circle, p. pr. of fr. ky`klos circle.] (Meteor.) A violent storm, often of vast extent, characterized by high winds rotating about a calm center of low atmospheric pressure. This center moves onward, often with a velocity of twenty or thirty miles an hour.

The atmospheric disturbance usually accompanying a cyclone, marked by an onward moving area of high pressure, is called an anticyclone.

(Cy*clon"ic) a. Pertaining to a cyclone.

(Cy"clop) n. See Note under Cyclops, 1.

(Cy`clo*pe"an) a. [L. Cyclopeus, Gr. fr. Cyclops: cf. F. cyclopeen.] Pertaining to the Cyclops; characteristic of the Cyclops; huge; gigantic; vast and rough; massive; as, Cyclopean labors; Cyclopean architecture.

(Cy`clo*pe"di*a Cy`clo*pæ"di*a) n. [NL., from Gr. ky`klos circle + paidei`a the bringing up of a child, education, erudition, fr. paidey`ein to bring up a child. See Cycle, and cf. Encyclopedia, Pedagogue.] The circle or compass of the arts and sciences (originally, of the seven so-called liberal arts and sciences); circle of human knowledge. Hence, a work containing, in alphabetical order, information in all departments of knowledge, or on a particular department or branch; as, a cyclopedia of the physical sciences, or of mechanics. See Encyclopedia.

(Cy`clo*ped"ic) a. Belonging to the circle of the sciences, or to a cyclopedia; of the nature of a cyclopedia; hence, of great range, extent, or amount; as, a man of cyclopedic knowledge.

(Cy`clo*pe"dist) n. A maker of, or writer for, a cyclopedia.

(Cy"cloid) n. [Cyclo- + -oid: cf. F. cycloïde.] (Geom.) A curve generated by a point in the plane of a circle when the circle is rolled along a straight line, keeping always in the same plane.

The common cycloid is the curve described when the generating point (p) is on the circumference of the generating circle; the curtate cycloid, when that point lies without the circumference; the prolate or inflected cycloid, when the generating point (p) lies within that circumference.

(Cy"cloid), a. (Zoöl.) Of or pertaining to the Cycloidei.

  By PanEris using Melati.

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