Usually means: State of prolonged unconsciousness medically.
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We found 65 dictionaries that define the word coma:

General (26 matching dictionaries)
  1. coma: Merriam-Webster.com
  2. coma, coma: American Heritage Dictionary of the English Language
  3. coma: Collins English Dictionary
  4. coma: Vocabulary.com
  5. Coma, com'a, coma, coma: Wordnik
  6. coma: Cambridge Advanced Learner's Dictionary
  7. coma: Wiktionary
  8. coma: Webster's New World College Dictionary, 4th Ed.
  9. coma: The Wordsmyth English Dictionary-Thesaurus
  10. coma: Infoplease Dictionary
  11. coma: Dictionary.com
  12. coma: Online Etymology Dictionary
  13. coma: Cambridge Essential American English Dictionary
  14. Coma (American miniseries), Coma (EP), Coma (Guns N' Roses song), Coma (Pendulum song), Coma (South Korean miniseries), Coma (U.S. TV miniseries), Coma (U.S. miniseries), Coma (US miniseries), Coma (band), Coma (comet), Coma (cometary), Coma (constellation), Coma (disambiguation), Coma (film), Coma (movie), Coma (novel), Coma (optics), Coma, The Coma, The coma: Wikipedia, the Free Encyclopedia
  15. Coma: Online Plain Text English Dictionary
  16. coma: Webster's Revised Unabridged, 1913 Edition
  17. coma: Rhymezone
  18. coma, coma, coma, coma (de), coma (m): AllWords.com Multi-Lingual Dictionary
  19. coma: Webster's 1828 Dictionary
  20. coma: Free Dictionary
  21. coma: Mnemonic Dictionary
  22. coma: LookWAYup Translating Dictionary/Thesaurus
  23. coma: Dictionary/thesaurus
  24. coma, coma: Oxford Learner's Dictionaries

Art (1 matching dictionary)
  1. English-Chinese Dictionary of Graphic Communications (Big 5) (No longer online)

Business (1 matching dictionary)
  1. coma: Legal dictionary

Computing (1 matching dictionary)
  1. Coma (medicine), coma: Encyclopedia

Medicine (19 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. Coma: MedTerms.com Medical Dictionary
  3. Medical Dictionary (No longer online)
  4. Coma: Diabetes Dictionary
  5. Coma: Merck Manuals
  6. online medical dictionary (No longer online)
  7. Lay Terms for Consent Forms (No longer online)
  8. Probert Encyclopaedia of Medicine (No longer online)
  9. Diabetes Dictionary (No longer online)
  10. Specific Diseases/Disorders (No longer online)
  11. Neurotrauma Glossary (No longer online)
  12. coma: Dictionary of Cancer Terms
  13. Disorder Index (No longer online)
  14. Coma (medicine), Coma (optics), -coma, coma: Medical dictionary
  15. Rudy's List of Archaic Medical Terms (No longer online)
  16. University of Maryland Glossary of Medical Terms (No longer online)
  17. Coma: Brain Injury
  18. Coma: Drug Medical Dictionary
  19. Hyperdictionary (No longer online)

Miscellaneous (4 matching dictionaries)
  1. Brilliant Dream Dictionary (No longer online)
  2. Sound-Alike Words (No longer online)
  3. COMA: Acronym Finder
  4. AbbreviationZ (No longer online)

Science (9 matching dictionaries)
  1. Coma: Eric Weisstein's World of Astronomy
  2. Coma: Eric Weisstein's World of Physics
  3. Coma: Dictionary of Horticultural Terms
  4. Botanical Terms (No longer online)
  5. Coma: Material Safety Data Sheets HyperGlossary
  6. Bryological (No longer online)
  7. Coma, coma: Extragalactic Astronomy
  8. coma: Nine Planets Glossary
  9. Flora of New South Wales (No longer online)

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

Tech (3 matching dictionaries)
  1. Basics of Space Flight Glossary (No longer online)
  2. Coma: Nikonians Photo Glossary
  3. PhotoNotes Dictionary of Film and Digital Photography (No longer online)

(Note: See comae as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  A state of unconsciousness from which one may not wake up, usually induced by some form of trauma.
noun:  (astronomy) A cloud of dust surrounding the nucleus of a comet.
noun:  (optics) A defect characterized by diffuse, pear-shaped images that in an ideal image would appear as points.
noun:  (botany) A tuft or bunch, such as the assemblage of branches forming the head of a tree, a cluster of bracts when empty and terminating the inflorescence of a plant, or a tuft of long hairs on certain seeds.

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