Usually means: Unable to sleep, chronic sleeplessness.
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We found 25 dictionaries that define the word insomniac:

General (21 matching dictionaries)
  1. insomniac: Merriam-Webster
  2. insomniac: Oxford Learner's Dictionaries
  3. insomniac: American Heritage Dictionary of the English Language
  4. insomniac: Collins English Dictionary
  5. insomniac: Vocabulary.com
  6. Insomniac, insomniac: Wordnik
  7. insomniac: Cambridge Advanced Learner's Dictionary
  8. insomniac: Wiktionary
  9. insomniac: The Wordsmyth English Dictionary-Thesaurus
  10. insomniac: Infoplease Dictionary
  11. insomniac: Dictionary.com
  12. Insomniac (Enrique Iglesias album), Insomniac (Green Day album), Insomniac (song), Insomniac: Wikipedia, the Free Encyclopedia
  13. insomniac: Rhymezone
  14. insomniac: FreeDictionary.org
  15. insomniac: Mnemonic Dictionary
  16. insomniac: TheFreeDictionary.com
  17. insomniac: Wikimedia Commons US English Pronunciations
  18. Insomniac (promoter): Wikipedia, the Free Encyclopedia
  19. insomniac: Longman Dictionary of Contemporary English

Computing (1 matching dictionary)
  1. Insomniac (health), insomniac: Encyclopedia

Medicine (3 matching dictionaries)
  1. insomniac: Merriam-Webster Medical Dictionary
  2. online medical dictionary (No longer online)
  3. Insomniac (health), insomniac: Medical dictionary

(Note: See insomnia as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  One who suffers an inability or difficulty sleeping; a sufferer from insomnia.
adjective:  Suffering from or pertaining to insomnia.

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