gadroon

noun

1. Architecture. an elaborately carved or indented convex molding.
2. a decorative series of curved, inverted flutings, or of convex and concave flutings, as on silversmith’s work.

noun

1. a moulding composed of a series of convex flutes and curves joined to form a decorative pattern, used esp as an edge to silver articles
2. architect a carved ornamental moulding having a convex cross section