Etymology
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decagon (n.)

"plane figure having ten sides and angles," 1630s, from Modern Latin decagonum, from Greek dekagonon, from deka "ten" (from PIE root *dekm- "ten") + gōnia "corner, angle" (from PIE root *genu- (1) "knee; angle"). Related: Decagonal.

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Definitions of decagon

decagon (n.)
a polygon with 10 sides and 10 angles;
From wordnet.princeton.edu