The Collaborative International Dictionary of English v.0.48:

Trachea \Tra"che*a\, n.; pl. Tracheae. [NL.,from L. trachia,
   Gr. trachei^a (sc. ? windpipe), from ? rough, rugged: cf. F.
   trach['e]e.]
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   1. (Anat.) The windpipe. See Illust. of Lung.
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   2. (Zool.) One of the respiratory tubes of insects and
      arachnids.
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   3. (Bot.) One of the large cells in woody tissue which have
      spiral, annular, or other markings, and are connected
      longitudinally so as to form continuous ducts.
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