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antinode



  1. A point, line, or surface in a standing wave where some characteristic of the wave field has maximum amplitude. A standing, or stationary, wave is one whose shape stays the same and that doesn't appear to move through a medium. It occurs when a traveling wave is reflected along its own path. Antinodes and nodes are separated by a quarter of a wavelength.

       • WAVES AND WAVE PHENOMENA



  2. Either of the two points on an orbit where a line in the orbit plane, perpendicular to the line of nodes, and passing through the focus, intersects the orbit.

       • CELESTIAL MECHANICS