A wind instrument made from a tube with holes along it that are stopped by the fingers or keys, held vertically or horizontally so that the player's breath strikes a narrow edge. The modern orchestral form, typically made of metal, is held horizontally and has an elaborate set of keys. An ornamental vertical groove in a column. A tall, narrow wine glass. Speak in a melodious way reminiscent of the sound of a flute. Make flutes or grooves in.