We found 21 dictionaries that define the word soporiferous:

General (16 matching dictionaries)

1. soporiferous: American Heritage Dictionary of the English Language
2. soporiferous: Collins English Dictionary
3. soporiferous: Vocabulary.com
4. soporiferous: Wordnik
5. soporiferous: Wiktionary
6. soporiferous: Infoplease Dictionary
7. soporiferous: Dictionary.com
8. Soporiferous: Online Plain Text English Dictionary
9. soporiferous: Webster's Revised Unabridged, 1913 Edition
10. soporiferous: Rhymezone
11. Soporiferous: AllWords.com Multi-Lingual Dictionary
12. soporiferous: Webster's 1828 Dictionary
13. soporiferous: FreeDictionary.org
14. soporiferous: The Phrontistery - A Dictionary of Obscure Words
15. soporiferous: Mnemonic Dictionary
16. soporiferous: TheFreeDictionary.com

Business (1 matching dictionary)

17. soporiferous: Legal dictionary

Computing (1 matching dictionary)

18. soporiferous: Encyclopedia

Medicine (3 matching dictionaries)

19. soporiferous: Merriam-Webster Medical Dictionary
20. online medical dictionary (No longer online)
21. soporiferous: Medical dictionary

(Note: See soporiferousness as well.)

Definitions from Wiktionary (soporiferous) ▸ adjective:  (archaic) soporific, sleep-inducing Similar: somnific, somniferous, soporific, uninteresting, depressant, narcotic, soporifical, soporifick, soporose, somniloquent, more... Opposite: stimulating, invigorating, energizing ▸ Words similar to soporiferous ▸ Usage examples for soporiferous ▸ Idioms related to soporiferous ▸ Wikipedia articles (New!) ▸ Popular nouns described by soporiferous ▸ Words that often appear near soporiferous ▸ Rhymes of soporiferous ▸ Invented words related to soporiferous