acciaccatura

n. Music
An ornament note that is one half step or one whole step below a principal note and is sounded at the same time as the principal note, adding dissonance to a harmony.

[Italian, from acciaccare, to crush.]

(It.)

A ‘crushed note’: an ornament consisting of an accessory note adjacent to (usually a semitone below) the main note, sounded with it and at once released.

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The noun has one meaning:

Meaning #1: an embellishing note usually written in smaller size
  Synonyms: grace note, appoggiatura

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