Usually means: Plant hormone regulating growth, development.
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We found 23 dictionaries that define the word auxin:

General (18 matching dictionaries)
  1. auxin: Merriam-Webster
  2. auxin: Oxford Learner's Dictionaries
  3. auxin: American Heritage Dictionary of the English Language
  4. auxin: Collins English Dictionary
  5. auxin: Vocabulary.com
  6. auxin: Wordnik
  7. auxin: Cambridge Advanced Learner's Dictionary
  8. auxin: Wiktionary
  9. auxin: Webster's New World College Dictionary, 4th Ed.
  10. auxin: The Wordsmyth English Dictionary-Thesaurus
  11. auxin: Infoplease Dictionary
  12. auxin: Dictionary.com
  13. Auxin: Wikipedia, the Free Encyclopedia
  14. auxin: Rhymezone
  15. auxin: FreeDictionary.org
  16. auxin: Mnemonic Dictionary
  17. auxin: TheFreeDictionary.com
  18. auxin: Merriam-Webster

Computing (1 matching dictionary)
  1. auxin: Encyclopedia

Medicine (3 matching dictionaries)
  1. auxin: Merriam-Webster Medical Dictionary
  2. online medical dictionary (No longer online)
  3. auxin: Medical dictionary

Science (1 matching dictionary)
  1. Botanical Terms (No longer online)

(Note: See auxinic as well.)

Definitions from Wiktionary (auxin)

noun:  (botany, biochemistry) A class of plant growth substance (often called phytohormones or plant hormones) which play an essential role in coordination of many growth and behavioral processes in the plant life cycle.

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