mouth harp(n = noun.artifact) harmonica, harp, mouth organ - a small rectangular free-reed instrument having a row of free reeds set back in air holes and played by blowing into the desired hole;
is a kind of free-reed instrument

aeolian harp, big mouth, by mouth, by word of mouth, down in the mouth, dragon's mouth, dry mouth, foam at the mouth, foaming at the mouth, froth at the mouth, frothing at the mouth, green adder's mouth, hand to mouth, harp, harp on, harp seal, jew's harp, jews' harp, keep one's mouth shut, mouth, mouth bow, mouth hole, mouth off, mouth organ, mouth watering, roof of the mouth, shoot one's mouth off, shut one's mouth, trench mouth, wind harp, word of mouth