Isotonic
Pronunciation : I`so*ton"ic
Part of Speech : a.
Etymology : [Iso- + tonic.]
Definition : Defn: Having or indicating, equal tones, or tension. Isotonic system (Mus.), a system consisting of intervals, in which each concord is alike tempered, and in which there are twelve equal semitones.
Source : Webster's Unabridged Dictionary, 1913