凸缘
Flanch \Flanch\, n.; pl. {Flanches}. [Prov. E., a projection, OF. flanche flank. See {Flank}.] 1. A flange. [R.]. (Her.) A bearing consisting of a segment of a circle encroaching on the field from the side. Note: Flanches are always in pairs. A pair of flanches is considered one of the subordinaries.