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 (Dictionary.com).
M.E. trache, from M.L. trachea, from L.L. trachia, from Gk. trakheia, in trakheia arteria "windpipe."
Nây, variants nay, ney, nâl "pipe, tube, reed, cane, windpipe;" Mid.Pers. nây "tube, reed, flute, clarion;" cf. Skt. nada-, nādha-, nala- "a hollow stalk, tube, pipe."