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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.
tra·che′o·lar (-ə-lər) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
tracheolethe small branching tubes from the TRACHEAE (2) of insects.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005