uptree /ˈʌp.tɹiː/adjective 1noun 1forms 1 adjective1 •Higher in a tree data structure. noun1 •A subtree of a tree data structure that is rooted at a child of the current node (where the root node is considered to be the bottom of a tree).The principal idea of [JAF 82] is that nodes do not start to update their routing table until all nodes in uptrees are notified. — 1986 formsuptrees