Pentagon, pen′ta-gon, n. (geom.) a plane figure having five angles and five sides: a fort with five bastions.—adj. Pentag′onal.—adv. Pentag′onally. [Gr. pentagōnon—pente, five, gōnia, angle.]
Pentagram, pen′ta-gram, n. a five-pointed star: a magic figure so called.—This is the proper pentacle.—adj. Pentagrammat′ic. [Gr. pente, five, gramma, a letter.]
Pentagraph=Pantograph.
Pentagynia, pent-a-jin′i-a, n. (bot.) a Linnæan order of plants, characterised by their flowers having five pistils.—n. Pent′agyn (bot.), a plant having five styles.—adjs. Pentagyn′ian, Pentag′ynous. [Gr. pente, five, gynē, a female.]
Pentahedron, pen-ta-hē′dron, n. (geom.) a solid figure bounded by five plane faces.—adj. Pentahē′dral. [Gr. pente, five, hedra, base.]
Pentalpha, pen-tal′fa, n. a five-pointed star: a pentacle. [Gr. pente, five, alpha.]
Pentameron, pen-tam′e-ron, n. a famous collection of fifty folk-tales (Naples 1637) written in the Neapolitan dialect by Giambattista Basile, supposed to be told during five days by ten old women, for the entertainment of a Moorish slave who has usurped the place of the rightful princess. [It. pentamerone.]
Pentamerous, pen-tam′ėr-us, adj. (bot.) consisting of or divided into five parts.—Pentamerus beds (geol.), a name applied to the upper and lower Llandovery rocks, full of the brachiopods called Pentamerus. [Gr. pente, five, meros, part.]