cusping

American  

[kuhs-ping] / ˈkʌs pɪŋ /

noun

1. Architecture. decoration in the form of a cusp, a pair of curves that are tangent to a real or imaginary line defining an area being decorated and that meet at a point within that area.

   Three-leaved motifs are cut into the jamb outside each inner and outer point of the cusping.

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Etymology

Origin of cusping

First recorded in 1795–1805