-gon
1.
a combining form meaning “angled,” “angular,” used in the formation of compound words:
polygon; pentagon.
Compare
gonio-
.
Origin
<
Greek
-gōnos,
derivative of
gōnía
angle, akin to
góny
knee
British Dictionary definitions for
-gon
-gon
combining form
1.
indicating a figure having a specified number of angles:
pentagon
Word Origin
from Greek
-gōnon,
from
gōnia
angle