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Definition of octagon

octagon

/ˈɑːk.tə.ɡɑːn/
oc · ta · gon
Adverb:octagonally
•
Plural:octagons
•
Adjective:octagonal
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octagon Lexical Profile

octagon Game Scores & Validity

• noun

1

A plane geometric figure with eight straight sides and eight angles.

Example

"A standard stop sign is shaped like a red octagon with white lettering."

2

A building, room, or architectural structure constructed on an eight-sided plan.

Example

"The historic library features a central octagon topped by a glass dome."

• Nearby Words

ocelot
ocher
ochna
octagon
octagonal
octane
octave

Word Origin & Etymology

Borrowed in the mid-17th century from Latin octagonos, from Ancient Greek oktágōnos ('eight-angled'), formed from októ ('eight') and gōnía ('angle, corner').

Cite this Entry

Wordmom. (2026). Definition of Octagon. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/octagon
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