We found 27 dictionaries that define the word hoarfrost:

General (20 matching dictionaries)

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

Computing (1 matching dictionary)

21. hoarfrost: Encyclopedia

Medicine (1 matching dictionary)

22. hoarfrost: Medical dictionary

Miscellaneous (2 matching dictionaries)

23. Encyclopedia of Graphic Symbols (No longer online)
24. hoarfrost: Wordcraft Dictionary

Science (1 matching dictionary)

25. Weather Glossary (No longer online)

Tech (2 matching dictionaries)

26. Glossary of Meteorology (No longer online)
27. Lake and Water Word Glossary (No longer online)

(Note: See hoarfrosts as well.)

Definitions from Wiktionary (Hoarfrost) ▸ noun:  Alternative form of hoar frost [Originally, any frozen dew forming a white deposit on exposed surfaces.] Similar: rime, frost, hoar, snow, icicle, snowscape, snowflake, snowfall, snowcovered, cindery, more... Opposite: thaw Types: rime, pilot, crystal, white frost, air frost, hoar, more... Adjectives: white, thick, heavy, first, light, old, slight, thin, cold, silvery, deep ▸ Words similar to hoarfrost ▸ Usage examples for hoarfrost ▸ Idioms related to hoarfrost ▸ Wikipedia articles (New!) ▸ Popular adjectives describing hoarfrost ▸ Words that often appear near hoarfrost ▸ Rhymes of hoarfrost ▸ Invented words related to hoarfrost