pentagon
nouncommon in dialogue
- United Kingdom//ˈpɛn.tə.ɡən//
- United Kingdom//ˈpɛn.tə.ɡɒn//
- Canada//ˈpɛn.təˌɡɑn//
A polygon with five sides and five angles.
noun
- 1
A polygon with five sides and five angles.
Meronyms: angle, side; see also Thesaurus:polygon
Imagine a vast sheet of paper on which straight Lines, Triangles, Squares, Pentagons, Hexagons, and other figures, instead of remaining fixed in their places, move freely about, […]
So if Colorado is not a rectangle, what is it? Well, not a pentagon, (Greek for 5-sider), hexagon (6-sider), or a heptagon (7-sider), but a—hold on to something—hexahectaenneacontakaiheptagon (697-sider).
- 2
A fort with five bastions.
Etymology
From Middle French pentagone, from Late Latin pentagōnum, from Ancient Greek πεντάγωνον (pentágōnon), noun use of the neuter of the adjective πεντάγωνος (pentágōnos, “five-angled”), from πέντε (pénte, “five”) + -γωνος (-gōnos, “angled”). Equivalent to penta- + -gon.
Forms
- plural
- pentagons