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A nine-sided polygon
Answer for the clue "A nine-sided polygon ", 7 letters:
nonagon
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Word definitions for nonagon in dictionaries
Wikipedia
Word definitions in Wikipedia
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 ...