Usually means: Respiratory openings in some animals.
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We found 13 dictionaries that define the word spiracles:

General (10 matching dictionaries)
  1. spiracles: Merriam-Webster
  2. spiracles: Collins English Dictionary
  3. spiracles: Vocabulary.com
  4. Spiracles, spiracles: Wordnik
  5. spiracles: Cambridge Advanced Learner's Dictionary
  6. Spiracles: InfoVisual Visual Dictionary
  7. spiracles: Wiktionary
  8. spiracles: Dictionary.com
  9. Spiracles: Wikipedia, the Free Encyclopedia
  10. Spiracles: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. Spiracles: Encyclopedia

Medicine (1 matching dictionary)
  1. Spiracles: Medical dictionary

Science (1 matching dictionary)
  1. Biological Control (No longer online)

(Note: See spiracle 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.
▸ Also see spiracle


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