Pronunciation: (trā'kē-uor, esp. Brit.,tru-kē'u),[key] —n., —pl.tra•che•aePronunciation: (trā'kē-ē" or, esp. Brit.,tru-kē'ē),[key]tra•che•as. 1. Anat.,Zool.the tube in humans and other air-breathing vertebrates extending from the larynx to the bronchi, serving as the principal passage for conveying air to and from the lungs; the windpipe. See diag. under lung. 2. (in insects and other arthropods) one of the air-conveying tubes of the respiratory system.
3. Bot.vessel (def. 5).