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One of the very small, branching tubes at the tips of the tracheae of an arthropod. Oxygen and carbon dioxide diffuse through the walls of the tracheoles.

[New Latin trāchēola, diminutive of Medieval Latin trāchēa, trachea; see trachea.]

tra·che′o·lar (-ə-lər) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Zoology) a small trachea found in some insects
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈtreɪ kiˌoʊl)

any of the smallest branches of an insect trachea.
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Gravid ovaries generally are covered with thin, fragile ovarian envelopes and have fewer tracheoles. The ovaries filled with mature eggs are elongated.
In all species, the appendices are heavily tracheated: Branches from midgut tracheal trunks surround the appendix bulbs, and multiple different tracheoles feed each appendix tubule along its length (Fig.
A proportion of unfed females from each species were dissected to extract ovaries and to determine parity by observing the degree of coiling of ovarian tracheoles [13].