edge, arris (boundary line of a surface; sharp edge or ridge formed by the intersection of two surfaces) · edge (1D polytope, joining line between two vertices of a polygon) · (undirected) edge
çekim: çoğul särmät · tamlayan särmän
köken: From Proto-Finnic *särmä, according to Aikio (2020) equivalent to särkeä (“to break”) + -mä. Cognate with Estonian särme and Veps särm, särmaine. Probably originally "strip, band, ribbon", later "(sharp) edge". Modern geometry sense was given to it by Finnish physician and author Samuel Roos.