Tasto

• (n.) A key or thing touched to produce a tone.
Found on http://thinkexist.com/dictionary/meaning/tasto/

Tasto

Tas'to noun [ Italian ] (Mus.) 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 octave...
Found on http://www.encyclo.co.uk/webster/T/14

Tasto

In music a tasto is a key or thing touched to produce a tone.
Found on http://www.probertencyclopaedia.com/browse/VT.HTM
No exact match found