The Collaborative International Dictionary
Arriswise
Arriswise \Ar"ris*wise`\, adv. Diagonally laid, as tiles; ridgewise.
Wiktionary
arriswise
adv. 1 (context tiling English) diagonally, tiles so laid relative to walls or walkway. 2 (context timber English) method of sawing lengthwise a timber beam of rectangular cross section, diagonally from corner to corner, to form two beams of triangular cross section.