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WordReference Random House Learner's Dictionary of American English © 2024-gon, suffix. - -gon comes from Greek, where it has the meaning "side;
angle.'' This suffix is attached to roots to form nouns that refer to plane figures having the number of sides mentioned: poly- (= many) + -gon → polygon (= a many-sided figure).
Collins Concise English Dictionary © HarperCollins Publishers:: -gon n combining form - indicating a figure having a specified number of angles: pentagon
Etymology: from Greek -gōnon, from gōnia angle gon-, - var. of gono- before a vowel:gonidium.
-gon, - a combining form meaning "angled,'' "angular,'' used in the formation of compound words:polygon; pentagon.Cf. gonio-.
- Greek -gōnos, derivative of gōnía angle, akin to góny knee
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