decagon

dec·a·gon Audio Help (děk'ə-gŏn')

n. A polygon with ten angles and ten sides.

[Medieval Latin decagōnum, from Greek dekagōnon, from neuter of dekagōnos, having ten angles : deka, ten; see dek in Indo-European roots + -gōnos, angled; see -gon.]
de·cag'o·nal (dĭ-kāg'ə-nəl) adj., de·cag'o·nal·ly adv.

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