Polysymmetrical, pol-i-si-met′ri-kal, adj. divisible into exactly similar halves by more than one plane.—adv. Polysymmet′rically.—n. Polysym′metry.

Polysyndeton, pol-i-sin′de-ton, n. (rhet.) figurative repetition of connectives or conjunctions.

Polysynthetic, -al, pol-i-sin-thet′ik, -al, adj. made up of many separate elements: formed by the combination of many simple words, as words in the native languages of America.—n. Polysyn′thesis.—adv. Polysynthet′ically.—ns. Polysynthet′icism, Polysyn′thetism, the character of being polysynthetic.

Polytechnic, -al, pol-i-tek′nik, -al, adj. comprehending many arts.—n. an exhibition of objects illustrating many arts: an institution in which many arts are taught.—ns. Polytech′nics, the science of the mechanical arts; Polytech′nique, or Polytechnic school, an industrial school in which the technical sciences that rest in great part upon a mathematical basis, such as engineering, architecture, &c., are taught. [Gr. polys, many, technē, an art.]

Polythalamous, pol-i-thal′a-mus, adj. having many cells or chambers.

Polytheism, pol′i-thē-izm, n. the doctrine of a plurality of gods.—v.i. Pol′ytheise, to adhere to, or conform to, polytheism.—n. Pol′ytheist, a believer in many gods.—adjs. Polytheist′ic, -al.—adv. Polytheist′ically. [Gr. polys, many, theos, a god.]

Polytocous, pō-lit′ō-kus, adj. producing many or several at a birth.

Polytrichum, pō-lit′ri-kum, n. a genus of mosses, widely distributed in north temperate and arctic countries.—adj. Polyt′richous, very hairy, densely ciliate. [Gr. polys, many, thrix, thrichos, hair.]

Polytype, pol′i-tīp, n. a cast or fac-simile of an engraving, matter in type, &c., produced by pressing a wood-cut or other plate into semi-fluid metal.—v.t. to reproduce by polytypage—also adj.n. Pol′ytypage, stereotyping by the above method.

Polyzoa, pol-i-zō′a, n.pl. a class of animals forming a crust on stones, shells, &c. under water:—sing. Polyzō′an, Polyzō′on.—adjs. Pol′yzoan, Polyzoā′rial.—ns. Polyzoā′rium, a compound polyzoan; Polyzō′ary, the polypary or polypidom of a polyzoan.—adjs. Polyzō′ic, filled with imaginary animals, zoolatrous; Polyzō′öid, consisting of many zoöids. [Gr. polys, many, zōon, an animal.]