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unction
unctuous
uncurl
uncus
uncut
undamped
undaunted
undead
undecagon
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undecagon
un·dec·a·gon [ un dékə gòn ] (plural un·dec·a·gons)


noun 
Definition:
 
11-sided plane figure: a two-dimensional geometric figure formed of eleven sides and eleven angles
[Early 18th century. < Latin undecim "eleven" + -gon, after decagon]
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