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1. A polygon with five sides and five angles.
2. Pentagon A five-sided building near Washington DC, containing the US Department of Defense and the offices of the US Armed Forces. Used with the.

[Late Latin pentagōnium, from Greek pentagōnon, from neuter of pentagōnos, pentagonal : penta-, penta- + -gōnos, angled; see -gon.]

pen·tag′o·nal (pĕn-tăg′ə-nəl) adj.
pen·tag′o·nal·ly adv.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.pentagonal - of or relating to or shaped like a pentagon
خُماسي الشَّكْل
beş köşeli


[penˈtægənl] ADJpentagonal




[pɛnˈtægənl] adjpentagonale


(ˈpentəgən) , ((American) -gon) noun
a 5-sided geometrical figure.
penˈtagonal (-ˈtӕ-) adjective
References in classic literature ?
The most common form for the construction of a house is five-sided or pentagonal, as in the annexed figure.
The good sense of the community has seconded the efforts of the Legislature; and now, even in the country, the pentagonal construction has superseded every other.
After all the pentagonal, hexagonal, and whimsical faces, which had succeeded each other at that hole without realizing the ideal of the grotesque which their imaginations, excited by the orgy, had constructed, nothing less was needed to win their suffrages than the sublime grimace which had just dazzled the assembly.
One is currently used as an office, while bedroom seven, which has a pentagonal window, acts as a dressing room to the main bedroom.
We then redefined the hand wrapping process to speed up the production process and determined that by folding into a pentagonal shape the product would cook up quickly in a microwave.
Many artists have used pentagonal forms in their work including Albrecht Durer, Leonardo da Vinci, Salvador Dali and Maurits Escher.
Competing in splendour at Adrian Sassoon's is Giovanni Corvaja's pentagonal brooch in platinum and gold (2013; Fig.
The Al-Nabulsi house has a pentagonal fountain under a lemon tree.
Plants terrestrial; rhizomes short, stout, ascending, scaly, the scales denticulate; leaves up to 2 m long; petioles about as long as the laminae; laminae 3- to 5-pinnate-pinnatifid, deltate or pentagonal to broadly lanceolate, gradually tapered to a pinnatifid apex, buds on rachises absent; basal pinnae inequilateral prolonged on the basiscopic side; suprabasal pinnae equilateral or nearly so; pinnules of suprabasal pinnae anadromic; rachises, costae, and costules with a thickened marginal ridge surcurrent on the segments of the next higher order (i.
7 feet in diameter and constructed of 20 hexagonal and 12 pentagonal steel pieces covered with translucent fabric
The pentagonal shape workpiece was selected as a test specimen and was cut from 6082-Al alloy with a thickness of 30 mm using a Resato ACM Waterjet machine equipped with a 2.
Lest one think geometry was the province of the moderns, however, Chorerra, a photograph of a patinated jug with pentagonal sides, interjected with ancient evidence of modernism's primitivist roots.