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Decoration with cusps.
(Architecture) architect decoration using cusps
cus•pi•da•tion(ˌkʌs pɪˈdeɪ ʃən)
decoration with cusps, as in architecture.
a form of ornamentation composed of cusps or curves meeting in pairs at a tangent to the area being decorated. — cuspidate, cuspidal, adj.See also: Architecture