variant of gono- before a vowel: gonidium.
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a combining form meaning “angled,” “angular,” used in the formation of compound words: polygon; pentagon.
Compare gonio-.

< Greek -gōnos, derivative of gōnía angle, akin to góny knee

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World English Dictionary
combining form
a variant of gono- : gonidium

n combining form
indicating a figure having a specified number of angles: pentagon
[from Greek -gōnon, from gōnia angle]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

gon- pref.
Variant of gono-.

The American Heritage® Stedman's Medical Dictionary
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