-gon

-gon

suff.
A figure having a specified kind or number of angles: isogon.

[Latin -gōnum, from Greek -gōnon, from neuter of -gōnos, angled, from gōniā, angle; see genu- in Indo-European roots.]

-gon

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

-gon

a combining form used in the names of geometrical figures having the number or sort of angles specified by the initial element: isogon; polygon.
[< Greek -gōnon, n. use of neuter of -gōnos, akin to gōnía angle, góny knee]