Polyconic projection(Map Making), a projection of the earth's surface, or any portion thereof, by which each narrow zone is projected upon a conical surface that touches the sphere along this zone, the conical surface being then unrolled. This projection differs from conic projection in that latter assumes but one cone for the whole map. Polyconic projection is that in use in the United States coast and geodetic survey.

(Pol`y*cot`y*le"don) n. [Poly- + cotyledon: cf. F. polycotylédone.] (Bot.) A plant that has many, or more than two, cotyledons in the seed.Pol`y*cot`y*led"on*ous a.

(Pol`y*cot`y*led"on*a*ry) a. [Poly- + cotyledonary.] (Anat.) Having the villi of the placenta collected into definite patches, or cotyledons.

(Po*lyc"ra*cy) n. [Poly- + -cracy, as in democracy.] Government by many rulers; polyarchy.

(Pol`y*crot"ic) a. [Poly- + Gr. krotei^n to beat.] (Physiol.) Of or pertaining to polycrotism; manifesting polycrotism; as, a polycrotic pulse; a polycrotic pulse curve.

(Po*lyc"ro*tism) n. (Physiol.) That state or condition of the pulse in which the pulse curve, or sphygmogram, shows several secondary crests or elevations; — contrasted with monocrotism and dicrotism.

(Pol`y*cys"tid) n. (Zoöl.) (a) One of the Polycystidea. (b) One of the Polycystina.a. Pertaining to the Polycystidea, or the Polycystina.

(||Pol`y*cys*tid"e*a) n. pl. [NL. See Poly-, and Cystidea.] (Zoöl.) A division of Gregarinæ including those that have two or more internal divisions of the body.

(||Pol`y*cys*ti"na) n. pl. [NL. See Poly-, and Cyst.] (Zoöl.) A division of Radiolaria including numerous minute marine species. The skeleton is composed of silica, and is often very elegant in form and sculpture. Many have been found in the fossil state.

(Pol`y*cys"tine) a. (Zoöl.) Pertaining to the Polycystina.n. One of the Polycystina.

(||Pol`y*cyt*ta"ri*a) n. pl. [NL., fr. Gr. poly`s many + dim. fr. a hollow vessel.] (Zoöl.) A division of Radiolaria. It includes those having one more central capsules.

(Pol`y*dac"tyl*ism) n. [Poly- + Gr. finger: cf. F. polydactylisme.] (Anat.) The possession of more that the normal number of digits.

(||Pol`y*dip"si*a) n. [NL., fr. Gr. poly`s much + thirst.] (Med.) Excessive and constant thirst occasioned by disease.

(Pol`y*e"dron) n. See Polyhedron.

(Pol`y*e"drous) a. See Polyhedral.

(Pol`y*ei"dic) a. [Poly- + Gr. form.] (Zoöl.) Passing through several distinct larval forms; — having several distinct kinds of young.

(Pol`y*chro"ni*ous) a. [Poly- + Gr. for a long time, time.] Enduring through a long time; chronic.

(Pol`y*clin"ic) n. [Poly- + clinic.] (Med.) A clinic in which diseases of many sorts are treated; especially, an institution in which clinical instruction is given in all kinds of disease.

(Pol`y*con"ic) a. [Poly- + conic.] Pertaining to, or based upon, many cones.

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