pentagonal

Having five sides

Pentagonal describes something having five sides and five angles, like a pentagon.

The word appears in geometry, architecture, and crystallography: a pentagonal prism, the pentagonal symmetry of a starfish.

The Pentagon, headquarters of the U.S.

Department of Defense, takes its name from its distinctive five-sided shape.

geometry

vertex

Point where edges converge

angleGeometric measure of rotation
diagonalSlanting line or path
symmetryInvariance under transformation

perimeter · area · convex · regular · irregular · polygon · plane · congruent · tessellation · tiling

nature

starfish

Five-armed marine invertebrate

flowerPlant's reproductive organ
okraEdible mucilaginous pod
hibiscusTropical flowering shrub

petal · symmetry · botanical · radial

fortress

military

Armed forces collectively

headquartersCentral command location
defenseProtection against harm
WashingtonU.S. seat of government

building · complex · memorial · Arlington · command · intelligence · briefing · security · government

design

tile

Flat surface-covering piece

mosaicInlaid pictorial arrangement
patternRecurring arrangement or template
tessellationGapless plane coverage

logo · badge · emblem · sign · facet · motif · ornament · architectural · decorative

Categories

patternspattern, chevron, geometric pattern, stripes, plaid
polygonspolygon, triangle, quadrilateral, hexagon, heptagon

Opposites

geometric form

pentagonalcircular

Forming a closed curve

round · curved · spherical · oval · elliptical

Phrases

The PentagonU.S. defense headquarters
Pentagon PapersLeaked Defense Department documents

Family

pentagon, pentagons

Familiarity: Top 200,000
Profile: Used worldwide · Timeless · Concrete · Everyday, not technical · Rated G