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We found 28 dictionaries with English definitions that include the word portentous:
Click on the first link on a line below to go directly to a page where "portentous" is defined.

General (26 matching dictionaries)

1. portentous: Merriam-Webster.com [home, info]
2. portentous: Oxford Learner's Dictionaries [home, info]
3. portentous: American Heritage Dictionary of the English Language [home, info]
4. portentous: Collins English Dictionary [home, info]
5. portentous: Vocabulary.com [home, info]
6. portentous: Macmillan Dictionary [home, info]
7. Portentous, portentous: Wordnik [home, info]
8. portentous: Cambridge Advanced Learner's Dictionary [home, info]
9. portentous: Wiktionary [home, info]
10. portentous: Webster's New World College Dictionary, 4th Ed. [home, info]
11. portentous: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. portentous: Infoplease Dictionary [home, info]
13. Portentous, portentous: Dictionary.com [home, info]
14. portentous: UltraLingua English Dictionary [home, info]
15. Portentous: Online Plain Text English Dictionary [home, info]
16. portentous: Webster's Revised Unabridged, 1913 Edition [home, info]
17. portentous: Rhymezone [home, info]
18. Portentous: AllWords.com Multi-Lingual Dictionary [home, info]
19. portentous: Webster's 1828 Dictionary [home, info]
20. portentous: Free Dictionary [home, info]
21. portentous: Mnemonic Dictionary [home, info]
22. portentous: WordNet 1.7 Vocabulary Helper [home, info]
23. portentous: LookWAYup Translating Dictionary/Thesaurus [home, info]
24. portentous: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

25. portentous: Legal dictionary [home, info]

Computing (1 matching dictionary)

26. portentous: Encyclopedia [home, info]

(Note: See portentousness for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (portentous) ▸ adjective:  of momentous or ominous significance ("Such a portentous...monster raised all my curiosity- Herman Melville") ▸ adjective:  of ominous significance ▸ adjective:  puffed up with vanity ▸ Also see portentousness ▸ Words similar to portentous ▸ Usage examples for portentous ▸ Idioms related to portentous (New!) ▸ Popular nouns described by portentous ▸ Words that often appear near portentous ▸ Rhymes of portentous ▸ Invented words related to portentous