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Webster 1913 Edition

Noun.

[L.

quindec

im fifteen + Gr. [GREEK] angle.]

(Geom.)

A plane figure with fifteen angles, and consequently fifteen sides.

Noun.

[L. quinque, five Gr. ten, and angle.]

In geometry, a plain figure with fifteen sides and fifteen angles.

quindecagon ‎(plural quindecagons)