Polysilicic acid(Chem.), any one of a series of acids formed by the condensation of two or more molecules of silicic acid, with elimination of water.

Polypragmaty
(Pol`y*prag"ma*ty) n. [Poly- + Gr. business.] The state of being overbusy. [R.]

Polyprotodonta
(||Pol`y*pro`to*don"ta) n. pl. [NL., fr. Gr. poly`s many + first + tooth.] (Zoöl.) A division of marsupials in which there are more fore incisor teeth in each jaw.

Polypteroidei
(||Po*lyp`te*roi"de*i) n. pl. [NL. See Polypterus, and -oid.] (Zoöl.) A suborder of existing ganoid fishes having numerous fins along the back. The bichir, or Polypterus, is the type. See Illust. under Crossopterygian.

Polypterus
(Po*lyp`te*rus) n. [NL., fr. Gr. poly`s many + feather, wing.] (Zoöl.) An African genus of ganoid fishes including the bichir.

Polyptoton
(||Pol`yp*to"ton) n. [L., fr. Gr. having, or being in, many cases; poly`s many + case.] (Rhet.) A figure by which a word is repeated in different forms, cases, numbers, genders, etc., as in Tennyson's line, — "My own heart's heart, and ownest own, farewell."

Polypus
(Pol"y*pus) n.; pl. E. Polypuses L. Polypi [L. See Polyp.]

1. (Zoöl.) Same as Polyp.

2. (Med.) A tumor, usually with a narrow base, somewhat resembling a pear, — found in the nose, uterus, etc., and produced by hypertrophy of some portion of the mucous membrane.

Polyrhizous
(Pol`y*rhi"zous) a. [Gr. poly`s many + root.] (Bot.) Having numerous roots, or rootlets.

Polyschematist
(Pol`y*sche"ma*tist) a. [Poly- + Gr. form, manner.] Having, or existing in, many different forms or fashions; multiform.

Polyscope
(Pol"y*scope) n. [Gr. farseeing; poly`s much, many + to view: cf. F. polyscope.]

1. (Opt.) A glass which makes a single object appear as many; a multiplying glass. Hutton.

2. (Med.) An apparatus for affording a view of the different cavities of the body.

Polysepalous
(Pol`y*sep"al*ous) a. [Poly- + sepal.] (Bot.) Having the sepals separate from each other.

Polysilicic
(Pol`y*si*lic"ic) a. [Poly- + silicic.] (Chem.) Of or pertaining to compounds formed by the condensation of two or more molecules of silicic acid.
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