Trill (noun)

A rapid alternation of two musical notes, typically a semitone or whole tone apart, to produce a warbling sound.

Origin:

Late 16th century: from italian trillo, from trillare 'to trill', from trillo 'a trill', of imitative origin.

Examples:

1. The bird sang a beautiful trill in the early morning.
2. The singer executed a flawless trill in her high notes.
3. The flute player added a trill to the end of the melody.
4. The trill was a common ornament used in Baroque music.
5. The pianist practiced his trills for hours each day.