We found 34 dictionaries that define the word alumina:

General (22 matching dictionaries)

1. alumina: Merriam-Webster
2. alumina: Oxford Learner's Dictionaries
3. alumina: American Heritage Dictionary of the English Language
4. alumina: Collins English Dictionary
5. alumina: Vocabulary.com
6. Alumina, alumina: Wordnik
7. alumina: Wiktionary
8. alumina: Webster's New World College Dictionary, 4th Ed.
9. alumina: The Wordsmyth English Dictionary-Thesaurus
10. alumina: Infoplease Dictionary
11. alumina: Dictionary.com
12. Alumina: Wikipedia, the Free Encyclopedia
13. Alumina: Online Plain Text English Dictionary
14. alumina: Webster's Revised Unabridged, 1913 Edition
15. alumina: Rhymezone
16. Alumina: AllWords.com Multi-Lingual Dictionary
17. alumina: Webster's 1828 Dictionary
18. alumina, alumina, alumina: Stammtisch Beau Fleuve Acronyms
19. alumina: FreeDictionary.org
20. alumina: Mnemonic Dictionary
21. alumina: TheFreeDictionary.com
22. alumina: Merriam-Webster

Business (1 matching dictionary)

23. Construction Term Glossary (No longer online)

Computing (1 matching dictionary)

24. alumina: Encyclopedia

Medicine (5 matching dictionaries)

25. alumina: Merriam-Webster Medical Dictionary
26. Dorland's Illustrated Medical Dictionary (No longer online)
27. online medical dictionary (No longer online)
28. alumina: Medical dictionary
29. Hyperdictionary (No longer online)

Tech (5 matching dictionaries)

30. AUTOMOTIVE TERMS (No longer online)
31. alumina: Printed Circuit Design and Manufacturing Glossary
32. Illustrated Glass Dictionary (No longer online)
33. Alumina: Pottery Studio
34. ALUMINA: Power Engineering

(Note: See aluminas as well.)

Definitions from Wiktionary (alumina) ▸ noun:  Aluminum oxide, especially when used in mining, material sciences or ceramics, a refractory solid compound. Similar: aluminum oxide, aluminium oxide, alundum, alumine, aluminia, orthoaluminate, alumstone, alum stone, aluminate, aloxite, more... Opposite: aluminia, non-alumina, anti-alumina Phrases: Activated alumina, alumina cement, hydrated alumina, alumina trihydrate, alumina porcelain, more... Adjectives: pure, activated, high, silica, hydrated, porous, sintered, fused, neutral, amorphous, more Colors:     white,     off-white,     beige,     cream,     light gray, more... ▸ Words similar to alumina ▸ Usage examples for alumina ▸ Idioms related to alumina ▸ Wikipedia articles (New!) ▸ Popular adjectives describing alumina ▸ Words that often appear near alumina ▸ Rhymes of alumina ▸ Invented words related to alumina