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Webster 1913 Edition

Undecagon

Un-dec′a-gon

,

Noun.

[L.

undecim

eleven + Gr. [GREEK] an angle.]

(Geom.)

A figure having eleven angles and eleven sides.

Webster 1828 Edition

Undecagon

UNDEC'AGON

,

Noun.

[L. undecim, eleven, and Gr. angle.] A figure of eleven angles or sides.