An example of the gon suffix is a five-sided shape; a pentagon.
Origin of gon
- Gr -gōnon < gōnia, an angle: see knee
From Webster's New World College Dictionary, 5th Edition
- Latin -gōnum from Greek -gōnon from neuter of -gōnos angled from gōniā angle genu-1 in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition