Tonophant \Ton"o*phant\ (t[=o]n"[-o]*fant), n. [Gr. to`nos a
tone + fai`nein to show.] (Physics.)
A modification of the kaleidophon, for showing composition of
acoustic vibrations. It consists of two thin slips of steel
welded together, their length being adjustable by a screw
socket.
[1913 Webster]