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octagon (n.)
1650s, from Latin
octagonos
, from Greek
oktagononos
, literally "eight-angled," from
okta-
comb. form of
okto
"eight" (see
eight
) +
gonia
"angle," related to
gony
"knee" (see
-gon
). Also
octogon
(1650s), from French
octogone
.