We found 33 dictionaries that define the word aquarium:

General (27 matching dictionaries)

1. aquarium: Merriam-Webster
2. aquarium: Oxford Learner's Dictionaries
3. aquarium: American Heritage Dictionary of the English Language
4. aquarium: Collins English Dictionary
5. aquarium: Vocabulary.com
6. Aquarium, aquarium: Wordnik
7. aquarium: Cambridge Advanced Learner's Dictionary
8. aquarium: Wiktionary
9. aquarium: Webster's New World College Dictionary, 4th Ed.
10. aquarium: The Wordsmyth English Dictionary-Thesaurus
11. aquarium: Infoplease Dictionary
12. Aquarium, aquarium: Dictionary.com
13. aquarium: Online Etymology Dictionary
14. aquarium: Cambridge Essential American English Dictionary
15. Aquarium (Aqua album), Aquarium (Suvorov), Aquarium (TV series), Aquarium (album), Aquarium (band), Aquarium (disambiguation), Aquarium, The Aquarium (U.S. TV series), The Aquarium (album), The Aquarium (band), The Aquarium (film), The Aquarium: Wikipedia, the Free Encyclopedia
16. Aquarium: Online Plain Text English Dictionary
17. aquarium: Webster's Revised Unabridged, 1913 Edition
18. aquarium: Rhymezone
19. Aquarium (nt), aquarium, aquarium (het), aquarium (m): AllWords.com Multi-Lingual Dictionary
20. aquarium: FreeDictionary.org
21. aquarium: Mnemonic Dictionary
22. aquarium: TheFreeDictionary.com
23. aquarium: Wikimedia Commons US English Pronunciations
24. aquarium: Longman Dictionary of Contemporary English
25. aquarium: Merriam-Webster

Computing (1 matching dictionary)

26. aquarium: Encyclopedia

Medicine (2 matching dictionaries)

27. online medical dictionary (No longer online)
28. aquarium: Medical dictionary

Miscellaneous (1 matching dictionary)

29. Brilliant Dream Dictionary (No longer online)

Slang (1 matching dictionary)

30. Aquarium: Urban Dictionary

Tech (1 matching dictionary)

31. Lake and Water Word Glossary (No longer online)

(Note: See aquaria as well.)

Definitions from Wiktionary ( ) ▸ noun:  A tank, often made of glass, for keeping live fish or other aquatic animals. ▸ noun:  A public place where live fish and other aquatic animals are exhibited. Similar: fish tank, vivarium, marine museum, fishtank, aquariist, fish cage, aquaterrarium, Aquarian, paludarium, fish bowl, more... Opposite: terrarium, terrariums Types: freshwater, saltwater, reef, nano, more... Phrases: reef aquarium, tropical aquarium, Georgia Aquarium, Monterey Bay Aquarium, Shedd Aquarium, more... Adjectives: large, marine, small, gallon, new, balanced, public, water, tropical, old, huge Colors:     teal,     aqua,     turquoise,     seafoam,     coral, more... ▸ Word origin ▸ Words similar to aquarium ▸ Usage examples for aquarium ▸ Idioms related to aquarium ▸ Wikipedia articles (New!) ▸ Popular adjectives describing aquarium ▸ Words that often appear near aquarium ▸ Rhymes of aquarium ▸ Invented words related to aquarium