mordent
noun
mor·dent ˈmȯr-dᵊnt 
mȯr-ˈdent
mȯr-ˈdent : a musical ornament made by a quick alternation of a principal tone with the tone immediately below it
Example Sentences
Recent Examples on the Web On the page, that ornament is a little squiggle called a mordent, instructing the player that the note should quickly alternate with one next to it. 
Peter Dobrin, Philly.com, 25 Feb. 2018
Peter Dobrin, Philly.com, 25 Feb. 2018 Word History
Etymology
Italian mordente, literally, biting, pungent, from Latin mordent-, mordens, present participle of mordēre
First Known Use
1806, in the meaning defined above