syr·inx 
(sîrĭngks)
(sîrĭngks)n. pl. sy·rin·ges (sə-rĭnjēz, -rĭnggēz) or syr·inx·es
1. Music See panpipe.
2. Zoology The vocal organ of a bird, consisting of thin vibrating muscles at or close to the division of the trachea into the bronchi.
[Latin sȳrinx, from Greek sūrinx.]
sy·ringe·al (sə-rĭnjē-əl) adj.