A node is one of the two kinds of objects that form a graph, the other being the edge. In stemmatology nodes correspond to witnesses, edges to the relationship "was copied from". Vertex is a synonym for node. Cf. also internal node.
Fig. 1. Example of a graph depicting the names of important parts of a graph or tree.
In other languages
DE: Knoten / Ecke
FR: nœud / sommet
IT: nodo / vertice