Usually means: Organism living off another organism.
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We found 56 dictionaries that define the word parasite:

General (26 matching dictionaries)
  1. parasite: Longman Dictionary of Contemporary English
  2. parasite: Merriam-Webster
  3. parasite: Oxford Learner's Dictionaries
  4. parasite: American Heritage Dictionary of the English Language
  5. parasite: Collins English Dictionary
  6. parasite: Vocabulary.com
  7. Parasite, parasite: Wordnik
  8. parasite: Cambridge Advanced Learner's Dictionary
  9. parasite: Wiktionary
  10. parasite: Webster's New World College Dictionary, 4th Ed.
  11. parasite: The Wordsmyth English Dictionary-Thesaurus
  12. parasite: Infoplease Dictionary
  13. parasite: Dictionary.com
  14. parasite: Online Etymology Dictionary
  15. parasite: Cambridge Essential American English Dictionary
  16. Parasite (Fractal Glider album), Parasite (Grant novel), Parasite (Heroes), Parasite (See You Next Tuesday album), Parasite (artist), Parasite (band), Parasite (comics), Parasite (disambiguation), Parasite (film), Parasite (journal), Parasite (song), Parasite, Parasite, The Parasite, The parasite: Wikipedia, the Free Encyclopedia
  17. Parasite: Online Plain Text English Dictionary
  18. parasite: Webster's Revised Unabridged, 1913 Edition
  19. parasite: Rhymezone
  20. parasite, parasite (m): AllWords.com Multi-Lingual Dictionary
  21. parasite: Webster's 1828 Dictionary
  22. parasite: FreeDictionary.org
  23. parasite: Mnemonic Dictionary
  24. parasite: TheFreeDictionary.com

Business (3 matching dictionaries)
  1. MoneyGlossary.com (No longer online)
  2. parasite: Legal dictionary
  3. BusinessDictionary.com (No longer online)

Computing (2 matching dictionaries)
  1. parasite: Netlingo
  2. parasite: Encyclopedia

Medicine (12 matching dictionaries)
  1. parasite: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Parasite: MedTerms.com Medical Dictionary
  4. AIDSinfo Glossary (No longer online)
  5. online medical dictionary (No longer online)
  6. Health and Wellness Dictionary (No longer online)
  7. Hepatitis C Information Central (No longer online)
  8. parasite: Dictionary of Cancer Terms
  9. Glossary of HIV/AIDS Related Terms (No longer online)
  10. parasite: Medical dictionary
  11. Parasite: Drug Medical Dictionary
  12. Hyperdictionary (No longer online)

Miscellaneous (2 matching dictionaries)
  1. Brilliant Dream Dictionary (No longer online)
  2. parasite: Wordcraft Dictionary

Science (9 matching dictionaries)
  1. Bird On! (No longer online)
  2. Botanical Terms (No longer online)
  3. Parasite: HYPP Zoology
  4. Flora of New South Wales (No longer online)
  5. Biological Control (No longer online)
  6. parasite: Evolution Glossary
  7. Fishkeeping glossary (No longer online)
  8. Glossary of Entomology (No longer online)
  9. parasite: Natural History Terms

Sports (1 matching dictionary)
  1. Cat Terms (No longer online)

Tech (1 matching dictionary)
  1. Dairy Glossary (No longer online)

(Note: See parasites as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (biology) An organism that lives on or in another organism of a different species, deriving benefit from living on or in that other organism, while not contributing towards that other organism sufficiently to cover the cost to that other organism.
noun:  (informal, specifically) An internal parasite that is an animal or protist.
noun:  (derogatory) A person who lives on other people's efforts or expense and gives little or nothing back.
noun:  (derogatory) A sycophant or hanger-on.
noun:  (literary, poetic) A climbing plant which is supported by a wall, trellis etc.
noun:  (historical) A retainer or companion of an ancient Celtic warrior, who praised him in song or poetry at gatherings; a bard.
noun:  (aviation) A component of a composite aircraft which is carried aloft and air-launched by a larger carrier aircraft or mother ship to support the primary mission of the carrier; a parasite aircraft.
noun:  (retail, used attributively) An isolated (FSDU) (freestanding display unit )
verb:  (rare) To parasitize.

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