We found 27 dictionaries that define the word arcanum:

General (20 matching dictionaries)

1. arcanum: Merriam-Webster
2. arcanum: American Heritage Dictionary of the English Language
3. arcanum: Collins English Dictionary
4. arcanum: Vocabulary.com
5. Arcanum, arcanum: Wordnik
6. arcanum: Wiktionary
7. arcanum: Webster's New World College Dictionary, 4th Ed.
8. arcanum: The Wordsmyth English Dictionary-Thesaurus
9. arcanum: Infoplease Dictionary
10. Arcanum, arcanum: Dictionary.com
11. Arcanum (Catholic encyclical), Arcanum (album), Arcanum (comics), Arcanum (disambiguation), Arcanum (encyclical), Arcanum (role-playing game), Arcanum, The Arcanum (novel): Wikipedia, the Free Encyclopedia
12. Arcanum: Online Plain Text English Dictionary
13. arcanum: Webster's Revised Unabridged, 1913 Edition
14. arcanum: Rhymezone
15. Arcanum: AllWords.com Multi-Lingual Dictionary
16. arcanum: Webster's 1828 Dictionary
17. arcanum: FreeDictionary.org
18. arcanum: Mnemonic Dictionary
19. arcanum: TheFreeDictionary.com
20. arcanum: Merriam-Webster

Business (1 matching dictionary)

21. arcanum: Legal dictionary

Computing (1 matching dictionary)

22. arcanum: Encyclopedia

Medicine (1 matching dictionary)

23. online medical dictionary (No longer online)

Miscellaneous (2 matching dictionaries)

24. arcanum: A Word A Day
25. arcanum: Wordcraft Dictionary

Science (1 matching dictionary)

26. arcanum: Dictionary of Botanical Epithets

Slang (1 matching dictionary)

27. Arcanum: Urban Dictionary

(Note: See arcana as well.)

Definitions from Wiktionary (arcanum) ▸ noun:  A mystery or deep secret. ▸ noun:  An elixir or secret remedy. Similar: secret, mystery, enigma, occult, black magic, mysterium, paradox, divination, mystique, magistery, more... Opposite: common knowledge, public knowledge, open secret Adjectives: great, grand, certain, major, heavenly, divine, whole, very, infallible, secret, supreme Colors:     midnight blue,     deep purple,     enchanted emerald,     shadow gray,     twilight lavender, more... ▸ Words similar to arcanum ▸ Usage examples for arcanum ▸ Idioms related to arcanum ▸ Wikipedia articles (New!) ▸ Popular adjectives describing arcanum ▸ Words that often appear near arcanum ▸ Rhymes of arcanum ▸ Invented words related to arcanum