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WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY

undecagon

Noun

un=dec=a=gon

WORDNET DICTIONARY

undecagon, n. [L. undecim eleven + Gr. an angle.].

A figure having eleven angles and eleven sides. [1913 Webster]

undecagon, n. = HENDECAGON.

Etymology

L undecim eleven, after decagon

For further exploring for "undecagon" in Webster Dictionary Online