Answer: syrinx

AnswerCrossword Clue
SYRINXPan flute
SYRINXVocal organ of a bird.
syrinxmountain nymph of Arcadia who was transformed, in order to protect her chastity from Pan, into the reed from which Pan then made the panpipe
syrinxthe vocal organ of a bird
syrinxpanpipe
syrinxthe vocal organ of birds, situated at or near the bifurcation of the trachea into the bronchi