Tasto
Pronunciation : Tas"to
Part of Speech : n.
Etymology : [It.] (Mus.)
Definition : Defn: A key or thing touched to produce a tone. Tasto solo, single touch; -- in old music, a direction denoting that the notes in the bass over or under which it is written should be performed alone, or with no other chords than unisons and octaves.
Source : Webster's Unabridged Dictionary, 1913