Usually means: Movement in response to light.
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We found 21 dictionaries that define the word phototaxis:

General (14 matching dictionaries)
  1. phototaxis: Merriam-Webster
  2. phototaxis: Oxford Learner's Dictionaries
  3. phototaxis: American Heritage Dictionary of the English Language
  4. phototaxis: Collins English Dictionary
  5. Phototaxis, phototaxis: Wordnik
  6. phototaxis: Wiktionary
  7. phototaxis: Webster's New World College Dictionary, 4th Ed.
  8. phototaxis: The Wordsmyth English Dictionary-Thesaurus
  9. phototaxis: Infoplease Dictionary
  10. phototaxis: Dictionary.com
  11. Phototaxis: Wikipedia, the Free Encyclopedia
  12. phototaxis: FreeDictionary.org
  13. phototaxis: The Phrontistery - A Dictionary of Obscure Words
  14. phototaxis: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. phototaxis: Encyclopedia

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

Science (2 matching dictionaries)
  1. Botanical Terms (No longer online)
  2. Fishkeeping glossary (No longer online)

Definitions from Wiktionary (phototaxis)

noun:  (biology) The movement of an organism either towards or away from a source of light

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