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 Italian etymon, mordente, both used in the 18th century to describe this musical figure. The word ultimately is derived from the Latin  (to bite).