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

Pentameter
(Pen*tam"e*ter) n. [L., fr. Gr. (see Penta-) + measure.] (Gr. & L.Pros.) A verse of five feet.

The dactylic pentameter consists of two parts separated by a diæresis. Each part consists of two dactyls and a long syllable. The spondee may take the place of the dactyl in the first part, but not in the second. The elegiac distich consists of the hexameter followed by the pentameter. Harkness.

Pentameter
(Pen*tam"e*ter), a. Having five metrical feet.

Pentamethylene
(Pen`ta*meth"yl*ene) n. [Penta- + methylene.] (Chem.) A hypothetical hydrocarbon, C5H10, metameric with the amylenes, and the nucleus of a large number of derivatives; — so named because regarded as composed of five methylene residues. Cf. Trimethylene, and Tetramethylene.

Pentandria
(||Pen*tan"dri*a) n. pl. [NL., fr. Gr. (see Penta-) + man, male.] (Bot.) A Linnæan class of plants having five separate stamens.

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

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

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

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

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

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

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

Pentail
(Pen"tail`) n. (Zoöl.) 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.

Pentalpha
(||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.

Pentamera
(||Pen*tam"e*ra) n. pl. [NL. See Pentamerous.] (Zoöl.) 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.

Pentameran
(Pen*tam"er*an) n. (Zoöl.) One of the Pentamera.

Pentamerous
(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. (Zoöl.) Belonging to the Pentamera.

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