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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
any of the smallest branches of an insect trachea.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.