[trey-kee-uh or, esp. British, truh-kee-uh]
noun, plural tracheae [trey-kee-ee or, esp. British, truh-kee-ee] , tracheas.
Anatomy, Zoology. 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.
(in insects and other arthropods) one of the air-conveying tubes of the respiratory system.
Botany, vessel ( def 5 ).

1350–1400; Middle English trache < Medieval Latin trāchēa, for Late Latin trāchīa < Greek trācheîa, short for artēría trācheîa rough artery, i.e., windpipe Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trachea (trəˈkiːə)
n , pl -cheae
1.  anatomy, zoology Nontechnical name: windpipe the membranous tube with cartilaginous rings that conveys inhaled air from the larynx to the bronchi
2.  any of the tubes in insects and related animals that convey air from the spiracles to the tissues
3.  botany vessel another name for tracheid
[C16: from Medieval Latin, from Greek trakheia, shortened from (artēria) trakheia rough (artery), from trakhus rough]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1400, from M.L. trachea (c.1255), as in trachea arteria, from L.L. trachia (c.400), from Gk. trakheia, in trakheia arteria "windpipe," lit. "rough artery" (so called from the rings of cartilage that form the trachea), from fem. of trakhys "rough." See artery for connection
with windpipe in Gk. science. Tracheotomy (1726) coined 1718 by Ger. surgeon Lorenz Heister (1683-1758) from Gk. -tomia "a cutting of," from tome "a cutting."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

trachea tra·che·a (trā'kē-ə)
n. pl. tra·che·as or tra·che·ae (-kē-ē')
The airway that extends from the larynx into the thorax where it divides into the right and left bronchi. It is composed of thin incomplete rings of hyaline cartilage connected by a membrane called the annular ligament. Also called windpipe.

tra'che·al adj.
The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
trachea   (trā'kē-ə)  Pronunciation Key 
Plural tracheae (trā'kē-ē') or tracheas
  1. The tube in vertebrate animals that leads from the larynx to the bronchial tubes and carries air to the lungs. In mammals the trachea is strengthened by rings of cartilage. Also called windpipe.

  2. Any of the tiny tubes originating from the spiracles of many terrestrial arthropods and forming a branching network that brings air directly to body cells.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
trachea [(tray-kee-uh)]

The tube connecting the mouth to the bronchial tubes that carries air to the lungs; the windpipe.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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