Usually means: Opening for breathing in arthropods.
Definitions Related words Mentions History
We found 29 dictionaries that define the word spiracle:

General (23 matching dictionaries)
  1. spiracle: Merriam-Webster
  2. spiracle: Oxford Learner's Dictionaries
  3. spiracle: American Heritage Dictionary of the English Language
  4. spiracle: Collins English Dictionary
  5. spiracle: Vocabulary.com
  6. spiracle: Wordnik
  7. spiracle: Cambridge Advanced Learner's Dictionary
  8. Spiracle: InfoVisual Visual Dictionary
  9. spiracle: Wiktionary
  10. spiracle: Webster's New World College Dictionary, 4th Ed.
  11. spiracle: The Wordsmyth English Dictionary-Thesaurus
  12. spiracle: Infoplease Dictionary
  13. spiracle: Dictionary.com
  14. Spiracle (arthropods), Spiracle (vertebrates), Spiracle: Wikipedia, the Free Encyclopedia
  15. Spiracle: Online Plain Text English Dictionary
  16. spiracle: Webster's Revised Unabridged, 1913 Edition
  17. spiracle: Rhymezone
  18. Spiracle: AllWords.com Multi-Lingual Dictionary
  19. spiracle: Webster's 1828 Dictionary
  20. spiracle: FreeDictionary.org
  21. spiracle: The Phrontistery - A Dictionary of Obscure Words
  22. spiracle: Mnemonic Dictionary
  23. spiracle: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. spiracle: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. spiracle: Medical dictionary

Science (3 matching dictionaries)
  1. Spiracle: HYPP Zoology
  2. Glossary of Entomology (No longer online)
  3. spiracle: Natural History Terms

(Note: See spiracles as well.)

Definitions from Wiktionary (spiracle)

noun:  A pore or opening used (especially by arthropods and some fish) for respiration.
noun:  The blowhole of a whale, dolphin or other similar species.
noun:  Any small aperture or vent for air or other fluid.

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