triller

noun3

1. •
   One who or that which trills.
2. •
   A small passerine bird of the genus Lalage belonging to the cuckooshrike family Campephagidae, so called because of the loud trilling calls of the male birds.
3. •
   A musical ornament consisting of a rapid alternation between two adjacent notes.

   • When the left hand is the triller, it might seem more difficult to stabilize with the right, which is mostly off the flute. — 2010