Part 168

Pen`ta*dec`a*to"ic (?), a. [Penta- + decatoic.] (Chem.) Of, pertaining to, or derived from, pentadecane, or designating an acid related to it.

Pen`ta*decyl"ic (?), a. [Penta- + decylic.] (Chem.) Same as Quindecylic.

Pen`ta*del"phous (?), a. [Penta- + Gr. &?; brother.] (Bot.) Having the stamens arranged in five clusters, those of each cluster having their filaments more or less united, as the flowers of the linden.

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Pen"ta*fid (?), a. [Penta- + root of L. findere to split.] (Bot.) Divided or cleft into five parts.

Pen"ta*glot (?), n. [Penta- + -glot, as in polyglot.] A work in five different tongues.

Pen"ta*gon (?), n. [Gr. &?;; &?; (see Penta-) + gwni`a angle: cf. L. pentagonium, F. pentagone.] (Geom.) A plane figure having five angles, and, consequently, five sides; any figure having five angles.

Regular pentagon, a pentagon in which the angles are all equal, and the sides all equal.

Pen*tag"o*nal (?), a. [Cf. F. pentagonal, pentagone, L. pentagonus, pentagonius, Gr. &?;.] Having five corners or angles.

Pentagonal dodecahedron. See Dodecahedron, and Pyritohedron.

Pen*tag"o*nal*ly, adv. In the form of a pentagon; with five angles. Sir T. Browne.

Pen*tag"o*nous (?), a. Pentagonal.

Pen"ta*gram (?), n. [Gr. &?;, neut. of &?; having five lines. See Penta-, and -gram.] A pentacle or a pentalpha. "Like a wizard pentagram." Tennyson.

{ Pen`ta*graph"ic (?), Pen`ta*graph"ic*al (?), } a. [Corrupted fr. pantographic, - ical.] Pantographic. See Pantograph.

||Pen`ta*gyn"i*a (?), n. pl. [NL., fr. Gr. &?; (see Penta-) + &?; ||female.] (Bot.) A LinnÊan order of plants, having five styles or ||pistils.

{ Pen`ta*gyn"i*an (?), Pen*tag"y*nous (?), } a. (Bot.) Of or pertaining to plants of the order Pentagyna; having five styles.

Pen`ta*he"dral (?), a. Having five sides; as, a pentahedral figure.

Pen`ta*hed"ric*al (?), a. Pentahedral. [R.]

Pen`ta*he"dron (?), n. [Penta- + Gr. "e`dra seat, base.] A solid figure having five sides.

Pen`ta*he"drous (?), a. Pentahedral. Woodward.

Pen"tail` (?), n. (Zoˆl.) A peculiar insectivore (Ptilocercus Lowii) of Borneo; -- so called from its very long, quill-shaped tail, which is scaly at the base and plumose at the tip.

||Pen*tal"pha (?), n. [NL., fr. Gr. &?;: cf. F. pentalpha. See Penta-, ||and Alpha.] A five-pointed star, resembling five alphas joined at ||their bases; -- used as a symbol.

||Pen*tam"e*ra (?), n. pl. [NL. See Pentamerous.] (Zoˆl.) An extensive ||division of Coleoptera, including those that normally have ||five-jointed tarsi. It embraces about half of all the known species ||of the Coleoptera.

Pen*tam"er*an (?), n. (Zoˆl.) One of the Pentamera.

Pen*tam"er*ous (?), a. [Penta- + Gr. &?; part.] 1. (Biol.) Divided into, or consisting of, five parts; also, arranged in sets, with five parts in each set, as a flower with five sepals, five petals, five, or twice five, stamens, and five pistils.

2. (Zoˆl.) Belonging to the Pentamera.

||Pen*tam"e*rus (?), n. [NL. See Pentamerous.] (Paleon.) A genus of ||extinct Paleozoic brachiopods, often very abundant in the Upper ||Silurian.

Pentamerus limestone (Geol.), a Silurian limestone composed largely of the shells of Pentamerus.