Definition of trachea in English:


Syllabification: tra·che·a
Pronunciation: /ˈtrākēə

noun (plural tracheae /-kēˌē/ or tracheas)

  • 1A large membranous tube reinforced by rings of cartilage, extending from the larynx to the bronchial tubes and conveying air to and from the lungs; the windpipe.
    More example sentences
    • The conducting portion of the respiratory system includes the nasal cavity, paranasal sinuses, nasopharynx, larynx, trachea, and bronchi.
    • If symptoms aren't improving in that time, see your doctor to make sure you don't have a bacterial infection in your lungs, larynx, trachea, sinuses or ears.
    • The larynx, trachea, and bronchi exhibited extensive squamous metaplasia of the mucosa with reactive atypia.
  • 1.1 Entomology Each of a number of fine chitinous tubes in the body of an insect, conveying air directly to the tissues.
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    • Breathing is by special gas exchange organs along the side of the body called tracheae and malpighian tubules.
    • This was a pretty far out idea, since blood-based gas exchange is what other arthropods use (including aquatic ones) but was previously thought to be completely absent in insects, which deliver air directly to their tissues via tracheae.
    • Although tracheae appear to be compressed synchronously, the shape and direction of compression varies within local tracheal segments, and to a lesser extent, between beetles.
  • 1.2 Botany Any duct or vessel in a plant, providing support and conveying water and salts.
    More example sentences
    • The formation of nodules of vascular tissue has been described as consisting of tracheas and islands of sieve elements in callus tissue grown in vitro.



More example sentences
  • The receptors have long fused rhabdoms and are surrounded by a tracheal tapetum.
  • The aquatic larvae or nymphs possess respiratory abdominal tracheal gills.
  • The air sacs leading into and out of the lungs hold a large volume of fresh air, so in general, the respiratory costs of tracheal elongation are probably not high.


Pronunciation: /-it, -ˌāt/
More example sentences
  • Myriapods have been traditionally considered the closest relatives of hexapods, thus implying only one origin of terrestriality for the tracheate lineage, but this view is now challenged by molecular evidence.
  • The insects are tracheate.
  • Insects are tracheate arthropods and employ direct transfer of respiratory gases to and from their sites of use and generation via the tracheal system.


late Middle English: from medieval Latin, from late Latin trachia, from Greek trakheia (artēria) 'rough (artery)', from trakhus 'rough'.

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