Usually means: Protein, forms filaments, cell movement.
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We found 25 dictionaries that define the word actin:

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

Art (1 matching dictionary)
  1. actin-: A Cross Reference of Latin and Greek Elements

Computing (1 matching dictionary)
  1. actin: Encyclopedia

Medicine (4 matching dictionaries)
  1. actin: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. online medical dictionary (No longer online)
  4. actin, actin(o)-, actin-: Medical dictionary

Miscellaneous (1 matching dictionary)
  1. ACTIN: Acronym Finder

Science (2 matching dictionaries)
  1. Agricultural Thesaurus and Glossary (No longer online)
  2. Glossary of Roots of Botanical Names (No longer online)

(Note: See actins as well.)

Definitions from Wiktionary (actin)

noun:  (biochemistry, uncountable) A globular structural protein that polymerizes in a helical fashion to form an actin filament (or microfilament).
noun:  (biochemistry, countable) One of the six isoforms of actin.

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