nonagon
non·a·gon/ˈnɑn.ə.ɡɑn/noun
nonagon is a noun meaning “A polygon with nine sides and nine angles” (English Wiktionary, September 2026). It is spelled N-O-N-A-G-O-N and has 3 syllables (non·a·gon), and it appears about once in every 33 million words in written English (wordfreq, 2021 data). The plural of nonagon is nonagons.
What does nonagon mean?
noun
- 1
A polygon with nine sides and nine angles.
Meronyms: angle, side; see also Thesaurus:polygon
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How do you pronounce nonagon?
- US /ˈnɑn.ə.ɡɑn/
- UK /ˈnɒn.ə.ɡən/
Nonagon has 3 syllables, split non·a·gon in writing.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: En-ca-nonagon.oga, Wikimedia Commons (author and licence on each file's page).
Forms of nonagon
- nonagons plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How common is nonagon?
Nonagon appears about once in every 33 million words in written English, the 176,009th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
Nonagon in Spanish, French, German and Portuguese
In the sense A polygon with nine sides and nine angles:
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does nonagon come from?
From nona- + -gon.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).