Noah Webster
Anacamptic
ANACAMP'TIC, adjective [Gr. to bend.]
1. Reflecting or reflected; a word formerly applied to that part of optics, which treats of reflection; the same as what is now called catoptric. [See Catoptrics.]
2. anacamptic sounds, among the Greeks, were sounds produced by reflection, as in echoes; or such as proceeded downwards from acute to grave.