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A polygon with ten sides and ten angles.

[Medieval Latin decagōnum, from Greek dekagōnon, from neuter of dekagōnos, having ten angles : deka, ten; see dekm̥ in Indo-European roots + -gōnos, angled; see -gon.]

de·cag′o·nal (dĭ-kăg′ə-nəl) adj.
de·cag′o·nal·ly adv.
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Local painter and cake decorator Rosalie LaCroix of Auburn may be best known as the artist who painted global flora and fauna on the 10-panel, plexiglass decagonal ceiling over the energy exhibit at the Worcester EcoTarium science and nature museum, but she is proudest of the work she did in the Adolescent Unit at Westboro State Hospital.
The fifteenth century is not scientifically hollow either: for example, one finds a host of intricate design patterns in Islamic architecture of the period that exhibit surprisingly advanced decagonal quasicrystal geometry--a concept discovered by Western mathematicians and physicists only in the 1970s and 1980s.
He made a special box of chocolates with three triangular sweets, four square sweets, five pentagonal sweets and so on up to 10 decagonal sweets.
29460(9) nm) and formation instead of y-phase of crystalline approximant of decagonal quasi-crystal--phase [O.
Ahora se conocen cuasicristales con simetria octagonal, decagonal, dodecagonal, e icosaedrica.