Cavetto \Ca*vet"to\ (k[.a]*v[e^]t"t[-o]), n. [It. cavetto, fr. cavo hollow, L. cavus.] (Arch.) A concave molding; -- used chiefly in classical architecture. See Illust. of {Column}.
cavetto n : a concave molding shaped like a quarter circle in cross section [also: {cavetti} (pl)]