Part 167

Here in the body pent.

J. Montgomery.

No pent-up Utica contracts your powers.

J. M. Sewall.

Pen"ta- (?). [Gr. &?;, a later combining form of &?; five. See Five.] 1. A combining form denoting five; as, pentacapsular; pentagon.

2. (Chem.) Denoting the degree of five, either as regards quality, property, or composition; as, pentasulphide; pentoxide, etc. Also used adjectively.

Pen`ta*ba"sic (?), a. [Penta- + basic.] (Chem.) Capable of uniting with five molecules of a monacid base; having five acid hydrogen atoms capable of substitution by a basic radical; -- said of certain acids.

Pen`ta*cap"su*lar (?), a. [Penta- + capsular.] (Bot.) Having five capsules.

Pen`ta*che"ni*um (?), n. [NL. See Penta-, and Achenium.] (Bot.) A dry fruit composed of five carpels, which are covered by an epigynous calyx and separate at maturity.

Pen`ta*chlo"ride (?), n. [Penta- + chloride.] (Chem.) A chloride having five atoms of chlorine in each molecule.

Pen"ta*chord (?), n. [L. pentachordus five-stringed, Gr. &?;; &?; five + &?; string.] 1. An ancient instrument of music with five strings.

2. An order or system of five sounds. Busby.

Pen*tac"id (&?;), a. [Penta- + acid.] (Chem.) Capable of neutralizing, or combining with, five molecules of a monobasic acid; having five hydrogen atoms capable of substitution by acid residues; -- said of certain complex bases.

Pen"ta*cle (?), n. [Gr. &?; five.] A figure composed of two equilateral triangles intersecting so as to form a six-pointed star, -- used in early ornamental art, and also with superstitious import by the astrologers and mystics of the Middle Ages.

Pen`ta*coc"cous (?), a. [See Penta- , Coccus.] (Bot.) Composed of five united carpels with one seed in each, as certain fruits.

Pen"ta*con`ter (?), n. (Gr. Antiq.) See Penteconter.

Pen*tac"ri*nin (?), n. (Physiol. Chem.) A red and purple pigment found in certain crinoids of the genus Pentacrinus.

Pen*tac"ri*nite (?), n. [Penta- + Gr. &?; a lily.] (Zoˆl.) Any species of Pentacrinus.

Pen*tac"ri*noid (?), n. [Pentacrinus + -oid.] (Zoˆl.) An immature comatula when it is still attached by a stem, and thus resembles a Pentacrinus.

||Pen*tac"ri*nus (?), n. [NL. See Penta-, and Crinum.] (Zoˆl.) A genus ||of large, stalked crinoids, of which several species occur in deep ||water among the West Indies and elsewhere.

Pen*ta"cron (?), n.; pl. L. Pentacra (#), E. Pentacrons (#). [NL., fr. Gr. &?; five + &?; a summit.] (Geom.) A solid having five summits or angular points.

Pen`ta*cros"tic (?), n. [Penta- + acrostic.] A set of verses so disposed that the name forming the subject of the acrostic occurs five times -- the whole set of verses being divided into five different parts from top to bottom.

Pen"tad (?), n. [Gr. &?;, &?;, a body of five, fr. &?; five.] (Chem.) Any element, atom, or radical, having a valence of five, or which can be combined with, substituted for, or compared with, five atoms of hydrogen or other monad; as, nitrogen is a pentad in the ammonium compounds.

Pen"tad, a. (Chem.) Having the valence of a pentad.

{ Pen`ta*dac"tyl, Pen`ta*dac"tyle } (?), a. [Gr. &?; with five fingers or toes. See Penta- , and Dactyl.] 1. (Anat.) Having five digits to the hand or foot.

2. Having five appendages resembling fingers or toes.

Pen`ta*dac"tyl*oid (?), a. [Pentadactyl + -oid.] (Anat.) Having the form of, or a structure modified from, a pentadactyl limb.

Pen`ta*dec"ane (?), n. [Penta- + Gr. &?; ten.] (Chem.) A hydrocarbon of the paraffin series, (C15H32) found in petroleum, tar oil, etc., and obtained as a colorless liquid; -- so called from the fifteen carbon atoms in the molecule.