noden.[L. nodus; perh. akin to E. knot. Cf. Noose, Nowed.]1. A knot, a knob; a protuberance; a swelling.()2. (Astron.) One of the two points where the orbit of a planet, or comet, intersects the ecliptic, or the orbit of a satellite intersects the plane of the orbit of its primary.()3. (Math., Computers) A special point in a graph or diagram which is attached to other points by links. It is often labeled and represented graphically as a box or circle. A node may represent any object which is related to other objects in a conceptual structure that can be represented as a graph, the relations being represented as links between the nodes.()4. (Anat.) A small mass of tissue differing from other tissue in its immediate vicinity; as, a lymph node.()Ascending node (Astron.), the node at which the body is passing northerly, marked with the symbol , called the Dragon's head. Called also northern node. -- Descending node, the node at which the body is moving southwardly, marked thus , called Dragon's tail. -- Line of nodes, a straight line joining the two nodes of an orbit.()