octadecagon

Noun

Meaning

octadecagon (plural octadecagons)

(geometry, rare) A polygon with 18 sides and 18 vertices.
A regular octadecagon cannot be constructed using a compass and straightedge.

Source: en.wiktionary.org

Synonyms

18-gon

Close letter words and terms

octadecadienoic acid octadecadienoyl octadecafluorooctane octadecahedral octadecahedron octadecahydrate