APPOGGIATURA
Etymology
Noun
appoggiatura (plural appoggiaturas)
(music) A type of musical ornament, falling on the beat, which often creates a suspension and subtracts for itself half the time value of the principal note which follows.
Source: Wiktionary
Ap*pog`gia*tu"ra, n. Etym: [It., fr. appogiarre to lean, to rest; ap-
(L. ad) + poggiare to mount, ascend, poggio hill, fr. L. podium an
elevated place.] (Mus.)
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition