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  1. A point of minimum displacement (zero amplitude) on a standing wave, such as the stationary points on a vibrating string. See also

       • WAVES AND WAVE PHENOMENA


  2. Either of the points on the celestial sphere at which the plane of an orbit intersects a reference plane. The position of a node is one of the standard orbital elements used to specify the orientation of an orbit. An antinode lies 90 of orbital longitude away from its corresponding node. See ascending node and descending node.

       • CELESTIAL MECHANICS


  3. In anatomy, a thickening or enlargement of an organ or tissue, such as a lymph node or the sinoatrial node in the heart.

       • ANATOMY AND PHYSIOLOGY


  4. In botany, the position on the stem of a plant from which a leaf or leaves grow.

       • BOTANY


  5. In analytical geometry, a point of intersection of two or more parts of a single curve.

       • ANALYTICAL GEOMETRY


  6. In information processing and telescommunications, a junction or connection point in a network, e.g., a terminal or a computer.

       • COMPUTERS, ARTIFICIAL INTELLIGENCE, AND CYBERNETICS