from The Century Dictionary.

  • noun The respiratory tract; the respiratory or branchial intestine considered as a part of the general intestinal system, being developed from the embryo in connection therewith. It consists of air-passages in the widest sense, as lungs, windpipes, etc., or their equivalents.


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  • The respiratory tract, considered as a specialized portion of the embryonic gastrointestinal tract.

    February 2, 2007