Usually means: Essential amino acid, induces sleep.
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We found 31 dictionaries that define the word tryptophan:

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

Computing (1 matching dictionary)
  1. tryptophan: Encyclopedia

Medicine (12 matching dictionaries)
  1. tryptophan: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Tryptophan: MedTerms.com Medical Dictionary
  4. Medical Dictionary (No longer online)
  5. Probert Encyclopaedia of Medicine (No longer online)
  6. Hepatitis C Information Central (No longer online)
  7. Tryptophan: MEDLINE plus Illustrated Medical Encyclopedia
  8. tryptophan: Medical dictionary
  9. University of Maryland Glossary of Medical Terms (No longer online)
  10. WeMove Glossary of Terms (No longer online)
  11. Tryptophan: Drug Medical Dictionary
  12. online medical dictionary (No longer online)

Science (1 matching dictionary)
  1. General Chemistry Online (No longer online)

Slang (1 matching dictionary)
  1. tryptophan: Urban Dictionary

Sports (1 matching dictionary)
  1. Tryptophan: Body Building

(Note: See tryptophans as well.)

Definitions from Wiktionary (tryptophan)

noun:  (biochemistry) An essential amino acid with an indole side chain; present in many foods, especially chocolate, oats, banana and milk; it is essential for normal growth and development and is the precursor of serotonin and niacin; any specific form of this compound, or any derivative of it.

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