
1) Acciaccatura 2) Melodic ornament
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https://www.crosswordclues.com/clue/mordent

In music, a mordent is an ornament indicating that the note is to be played with a single rapid alternation with the note above or below. Like trills, they can be chromatically modified by a small flat, sharp or natural accidental. The term entered English musical terminology at the beginning of the 19th century, from the German Mordent and its It...
Found on
http://en.wikipedia.org/wiki/Mordent

rapidly alternating a tone with one half-tone lower; reverse trill
Found on
http://phrontistery.info/m.html

mordent 1. A melodic ornament in which a principal tone is rapidly alternated with the tone a half or full step below. 2. Etymology: From German, from Italian mordente, from mordere, 'to bite', from Latin mordere, from Latin mordre.
Found on
http://www.wordinfo.info/words/index/info/view_unit/3346/

a melodic embellishment consisting of a rapid alternation of a principal tone with the tone a half or a whole step below it, called single or short when the auxiliary tone occurs once and double or long when this occurs twice or more. · See
Found on
https://www.infoplease.com/dictionary/mordent
No exact match found.