We found 10 dictionaries that define the word ice crystals:

General (6 matching dictionaries)

1. ice crystals: Merriam-Webster
2. ice crystals: Vocabulary.com
3. ice-crystals: Wordnik
4. ice crystals: Infoplease Dictionary
5. ice crystals: Dictionary.com
6. Ice crystals: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)

7. Ice crystals: Encyclopedia

Medicine (1 matching dictionary)

8. Ice crystals: Medical dictionary

Science (1 matching dictionary)

9. Weather Glossary (No longer online)

Tech (1 matching dictionary)

10. National Weather Service Glossary (No longer online)

(Note: See ice_crystal as well.)

Definitions from Wiktionary (ice crystal) ▸ noun:  A small, solid form of water in symmetrical shapes including hexagonal columns, hexagonal plates, and dendritic crystals. ▸ Also see ice_crystal Types: sleet, hail, snow, more... ▸ Words similar to ice crystals ▸ Usage examples for ice crystals ▸ Idioms related to ice crystals ▸ Wikipedia articles (New!) ▸ Words that often appear near ice crystals ▸ Rhymes of ice crystals ▸ Invented words related to ice crystals