Semitone
Pronunciation : Sem"i*tone
Part of Speech : n.
Etymology : [Pref. semi- + tone. CF. Hemitone.] (Mus.)
Definition : Defn: Half a tone; -- the name commonly applied to the smaller intervals of the diatonic scale.
Note: There is an impropriety in the use of this word, and half step is now preferred. See Tone. J. S. Dwight.
Source : Webster's Unabridged Dictionary, 1913