Flageolet \Flag"eo*let`\, n. [F. flageolet, dim. of OF. flaj?l (as if fr. a LL. flautio;us), of fla["u]te, flahute, F. fl?te. See Flute.]

(Mus.) A small wooden pipe, having six or more holes, and a mouthpiece inserted at one end. It produces a shrill sound, softer than of the piccolo flute, and is said to have superseded the old recorder.

Flageolet tones (Mus.), the naturel harmonics or overtones of stringed instruments.

Source: Webster's Revised Unabridged Dictionary (1913)