- The vocal organ of a bird, consisting of thin vibrating muscles at or close to the division of the trachea into the bronchi.
- Same as <internalXref urlencoded="Pan%27s%20pipes">Pan's pipes</internalXref> (which see, under <internalXref urlencoded="pipe">pipe</internalXref>).
- In <em>Egypt. archæol.</em>, a narrow and deep rock-cut channel or tunnel forming a characteristic feature of Egyptian tombs of the New Empire.
- In <em>anatomy</em>, the Eustachian tube.
- In <em>ornithology</em>, the voice-organ of birds; the lower larynx, situated at or near the bifurcation of the trachea into the bronchi, and serving to modulate the voice, as in singing.
- In <em>surgery</em>, a fistula.
- In some of the brachiopods, like <internalXref urlencoded="Syringothyris">Syringothyris</internalXref>, a split tubular structure developed from the deltidial plates, lying within the umbonal region of the ventral valve, and inclosing or forming a passage for the pedicle.
- A wind instrument made of reeds tied together; -- called also <altname>pandean pipes</altname>.
- The lower larynx in birds.
- A set of <xref>pan-pipes</xref>.
- A narrow channel cut in rock, especially in ancient Egyptian tombs.
- The voice organ in <xref>birds</xref>.
- A rare, fluid-filled <xref>neuroglial</xref> cavity within the <xref>spinal cord</xref> or in the <xref>brain stem</xref>
- the vocal organ of a bird
- a primitive wind instrument consisting of several parallel pipes bound together