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The Collaborative International Dictionary
Nonagon

Nonagon \Non"a*gon\, n. [L. nonus ninth + Gr. ? angle.] (Math.) A plane figure or polygon having nine sides and nine angles.

Douglas Harper's Etymology Dictionary
nonagon

"plane figure with nine sides," 1680s, a hybrid from Latin nonus "ninth" (see nones) + ending from pentagon, etc.

Wiktionary
nonagon

n. (context geometry English) A polygon with nine sides and nine angles.

WordNet
nonagon

n. a nine-sided polygon

Wikipedia
Nonagon

In geometry, a nonagon (or enneagon ) is a nine-sided polygon or 9-gon.

The name "nonagon" is a prefix hybrid formation, from Latin (nonus, "ninth" + gonon), used equivalently, attested already in the 16th century in French nonogone and in English from the 17th century. The name "enneagon" comes from Greek enneagonon (εννεα, "nine" + γωνον (from γωνία = "corner")), and is arguably more correct, though somewhat less common than "nonagon".