From ZooTerms (Dictionary of Invertebrate Zoology)
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trachea (noun; plural tracheae; Latin trachia, windpipe): 1. The windpipe.

2. (Arthropoda: Chelicerata) For Arachnida, see tube, sieve trachea.

3. (Arthropoda: Insecta) The larger tubes of the respiratory system, lined with taenidia, opening to the outside through the spiracles and terminating internally in the tracheoles.

4. (Mollusca: Gastropoda) see ctenidia.

5. (Onychophora) In Peripatus, short tubes without spiral thickenings, neither branching nor anastomosing, opening externally through numerous minute spiracles.