Echometer

• (n.) A graduated scale for measuring the duration of sounds, and determining their different, and the relation of their intervals.
Found on http://thinkexist.com/dictionary/meaning/echometer/

Echometer

E·chom'e·ter noun [ Greek ..., ..., sound + -meter : confer French échomètre .] (Mus) A graduated scale for measuring the duration of sounds, and determining their different, and the relation of their intervals. J. J. Rousseau.
Found on http://www.encyclo.co.uk/webster/E/6
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