(ol'i-gō glū-kō'si-dās) A glucanohydrolase cleaving α-1,6 links in isomaltose and dextrins produced from starch and glycogen by α-amylase; secreted into the duodenum; a deficiency of this enzyme leads to defects in intestinal digestion of limit dextrins. See also: sucrose alpha-D-glucohydrolase