Appoggiatura

Ap·pog·gia·tu·ra

Appoggiatura

n.
  1. A passing tone preceding an essential tone, and borrowing the time it occupies from that; a short auxiliary or grace note one degree above or below the principal note unless it be of the same harmony; -- generally indicated by a note of smaller size, as in the illustration above. It forms no essential part of the harmony. (Mus.)