[1] : The Collaborative International Dictionary of English v.0.48

windpipe \wind"pipe`\, n. anat.
   the passage for the breath from the larynx to the lungs; the
   trachea; the weasand. see illust. under lung.
   1913 webster
see also:
lung 

[2] : WordNet (r) 2.0

windpipe
     n : membranous tube with cartilaginous rings that conveys
         inhaled air from the larynx to the bronchi syn: trachea
see also:
trachea 

Windpipe >> W Words
Windpipe, definition of term: Windpipe
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