We found 23 dictionaries that define the word hypersomnia:

General (12 matching dictionaries)

1. hypersomnia: Merriam-Webster
2. hypersomnia: Collins English Dictionary
3. hypersomnia: Vocabulary.com
4. hypersomnia: Wordnik
5. hypersomnia: Wiktionary
6. hypersomnia: Infoplease Dictionary
7. hypersomnia: Dictionary.com
8. Hypersomnia: Wikipedia, the Free Encyclopedia
9. hypersomnia: Rhymezone
10. hypersomnia: FreeDictionary.org
11. hypersomnia: Mnemonic Dictionary
12. hypersomnia: TheFreeDictionary.com

Computing (1 matching dictionary)

13. hypersomnia: Encyclopedia

Medicine (9 matching dictionaries)

14. hypersomnia: Merriam-Webster Medical Dictionary
15. Dorland's Illustrated Medical Dictionary (No longer online)
16. Hypersomnia: Merck Manuals
17. online medical dictionary (No longer online)
18. Disorder Index (No longer online)
19. Terms in the field of Psychiatry and Neurology (No longer online)
20. Sleep Terms (No longer online)
21. hypersomnia: Medical dictionary
22. University of Maryland Glossary of Medical Terms (No longer online)

Slang (1 matching dictionary)

23. Hypersomnia: Urban Dictionary

(Note: See hypersomnias as well.)

Definitions from Wiktionary (hypersomnia) ▸ noun:  (medicine, pathology) Excessive sleepiness. Similar: hypersomnolence, idiopathic hypersomnia, hyposomnia, parasomnia, somnopathy, dyssomnia, orthosomnia, somnipathy, sopor, agrypnia, more... Phrases: idiopathic hypersomnia, primary hypersomnia, hypersomnia sleep apnea syndrome, hypersomnia types, secondary hypersomnia, more... Adjectives: idiopathic, periodic, primary, recurrent, daytime, central, nervous, related, linked, traumatic, posttraumatic ▸ Words similar to hypersomnia ▸ Usage examples for hypersomnia ▸ Idioms related to hypersomnia ▸ Wikipedia articles (New!) ▸ Popular adjectives describing hypersomnia ▸ Words that often appear near hypersomnia ▸ Rhymes of hypersomnia ▸ Invented words related to hypersomnia