syrinx

noun4

1. •
   The voice organ in birds, located at or near where the trachea and the bronchi join.
2. •
   A set of panpipes.

   • Pipes will I fashion of the syrinx flag, / That thou mayst always know whither I roam, / When it shall please thee in our quiet home / To listen and think of love. — 1818
3. •
   Any of several abnormal tube-shaped structures in the body, especially a rare, fluid-filled neuroglial cavity in the brain stem or within the spinal cord.

   • The division of fluid-filled cavities, or syrinxes, into those lined with ependyma (hydromyelia) and those not so lined (syringomyelia) is probably somewhat artificial. — 1989
4. •
   Chiefly in the plural: a narrow channel cut in rock, especially in Ancient Egyptian burial chambers.