dodecagon

do·dec·a·gon Audio Help (dō-děk'ə-gŏn')

n. A polygon with 12 sides.

[Greek dōdekagōnon : dōdeka, twelve (duo, two; see dwo- in Indo-European roots + deka, ten; see dek in Indo-European roots) + -gōnon, -gon.]
do'de·cag'o·nal (dō'dě-kāg'ə-nəl) adj.

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