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We found 36 dictionaries with English definitions that include the word impregnable:
Click on the first link on a line below to go directly to a page where "impregnable" is defined.

General (31 matching dictionaries)

1. impregnable: Merriam-Webster.com [home, info]
2. impregnable: Oxford Dictionaries [home, info]
3. impregnable, impregnable: American Heritage Dictionary of the English Language [home, info]
4. impregnable: Collins English Dictionary [home, info]
5. impregnable: Vocabulary.com [home, info]
6. impregnable: Macmillan Dictionary [home, info]
7. Impregnable, impregnable: Wordnik [home, info]
8. impregnable: Cambridge Advanced Learner's Dictionary [home, info]
9. impregnable: Wiktionary [home, info]
10. impregnable: Webster's New World College Dictionary, 4th Ed. [home, info]
11. impregnable: V2 Vocabulary Building Dictionary [home, info]
12. impregnable: The Wordsmyth English Dictionary-Thesaurus [home, info]
13. impregnable: Infoplease Dictionary [home, info]
14. Impregnable, impregnable: Dictionary.com [home, info]
15. impregnable: Online Etymology Dictionary [home, info]
16. impregnable: UltraLingua English Dictionary [home, info]
17. impregnable: Cambridge Dictionary of American English [home, info]
18. Impregnable: Online Plain Text English Dictionary [home, info]
19. impregnable: Webster's Revised Unabridged, 1913 Edition [home, info]
20. impregnable: Rhymezone [home, info]
21. Impregnable: AllWords.com Multi-Lingual Dictionary [home, info]
22. impregnable: Webster's 1828 Dictionary [home, info]
23. impregnable: Hutchinson's Dictionary of Difficult Words [home, info]
24. impregnable: Free Dictionary [home, info]
25. impregnable: Hutchinson Dictionaries [home, info]
26. impregnable: Mnemonic Dictionary [home, info]
27. impregnable: WordNet 1.7 Vocabulary Helper [home, info]
28. impregnable: LookWAYup Translating Dictionary/Thesaurus [home, info]
29. impregnable: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

30. impregnable: Legal dictionary [home, info]

Computing (1 matching dictionary)

31. impregnable: Encyclopedia [home, info]

Medicine (1 matching dictionary)

32. impregnable: online medical dictionary [home, info]

Miscellaneous (1 matching dictionary)

33. impregnable, impregnable: A Word A Day [home, info]

Slang (1 matching dictionary)

34. impregnable: Urban Dictionary [home, info]

(Note: See impregnably for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (impregnable) ▸ adjective:  able to withstand attack ("An impregnable fortress") ▸ adjective:  impossible to take by storm ▸ Also see impregnably ▸ Word origin ▸ Words similar to impregnable ▸ Usage examples for impregnable ▸ Popular nouns described by impregnable ▸ Words that often appear near impregnable ▸ Rhymes of impregnable ▸ Invented words related to impregnable