enneagon

== English == === Etymology === From ennea- +‎ -gon. === Pronunciation === (UK) IPA(key): /ˈɛ.niː.ə.ɡən/ === 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 ==== 9-gon nonagon nonangle ==== Related terms ==== enneagonal ==== Translations ==== ==== Further reading ==== enneagon on Wikipedia.Wikipedia