We found 21 dictionaries that define the word rock crystal:

General (17 matching dictionaries)

1. rock crystal: Merriam-Webster
2. rock crystal: Oxford Learner's Dictionaries
3. rock crystal: American Heritage Dictionary of the English Language
4. rock crystal: Collins English Dictionary
5. rock crystal: Vocabulary.com
6. rock-crystal, rock crystal: Wordnik
7. rock crystal: Wiktionary
8. rock crystal: The Wordsmyth English Dictionary-Thesaurus
9. rock crystal: Infoplease Dictionary
10. rock crystal: Dictionary.com
11. Rock Crystal (novella), Rock Crystal, Rock-crystal, Rock crystal: Wikipedia, the Free Encyclopedia
12. rock crystal: Rhymezone
13. rock-crystal: Webster's 1828 Dictionary
14. Rock Crystal: Dictionary of Phrase and Fable (1898)
15. rock crystal: FreeDictionary.org
16. rock crystal: Mnemonic Dictionary
17. rock crystal: TheFreeDictionary.com

Computing (1 matching dictionary)

18. rock crystal: Encyclopedia

Medicine (1 matching dictionary)

19. rock crystal: Medical dictionary

Miscellaneous (1 matching dictionary)

20. Encyclopedia of Graphic Symbols (No longer online)

Science (1 matching dictionary)

21. ROCK CRYSTAL: The Mineral Gallery

(Note: See rock_crystals as well.)

Definitions from Wiktionary (rock crystal) ▸ noun:  A clear, colorless form of the silica-based mineral quartz. Similar: transparent quartz, crystal, pebble, Chrystal, milky quartz, quartz crystal, quartz, quartzine, chrystall, microquartz, more... Opposite: amorphous, opaque, cloudy, unclear, noncrystalline ▸ Words similar to rock crystal ▸ Usage examples for rock crystal ▸ Idioms related to rock crystal ▸ Wikipedia articles (New!) ▸ Words that often appear near rock crystal ▸ Rhymes of rock crystal ▸ Invented words related to rock crystal