An Etymological Dictionary of the German Language/Quader

by Friedrich Kluge

Quader, m., ‘squared stone,’ from the equiv. MidHG. quâder, m. and n., which is based on Lat. quā̆drum, ‘square,’ or rather quā̆drus (scil. lapis), ‘square stone.’ Comp. Ital. quadro, ‘square,’ Prov. caire, ‘square stone’ (Ital. quadrello, Fr. carreau).