ENNEAGON

Etymology

Noun

enneagon (plural enneagons)

(geometry) A polygon with nine sides; a nonagon.

Usage notes

• While enneagon is etymologically consistent with pentagon, hexagon, etc, in that it uses a Greek prefix and suffix as opposed to a Latin prefix and a Greek suffix, its use is rare; nonagon is the more common term.

Synonyms

• nonagon

Source: Wiktionary

En"ne*a*gon, n. Etym: [Gr. ennéagone.] (Geom.)

Definition: A polygon or plane figure with nine sides and nine angles; a nonagon.

Source: Webster’s Unabridged Dictionary 1913 Edition

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