We found 19 dictionaries that define the word ferns:

General (12 matching dictionaries)

1. ferns: Merriam-Webster
2. ferns: Oxford Learner's Dictionaries
3. ferns: Collins English Dictionary
4. ferns: Vocabulary.com
5. Fern's, Ferns, Ferns, ferns: Wordnik
6. ferns: Cambridge Advanced Learner's Dictionary
7. ferns: Wiktionary
8. ferns: Dictionary.com
9. ferns: Cambridge Essential American English Dictionary
10. Ferns (disambiguation), Ferns: Wikipedia, the Free Encyclopedia
11. Ferns: Rhymezone
12. Ferns: TheFreeDictionary.com

Computing (1 matching dictionary)

13. Ferns: Encyclopedia

Medicine (2 matching dictionaries)

14. Medical Dictionary (No longer online)
15. Ferns: Medical dictionary

Miscellaneous (2 matching dictionaries)

16. Brilliant Dream Dictionary (No longer online)
17. FERNS: Acronym Finder

Science (1 matching dictionary)

18. A Modern Herbal, 1931, by Mrs. M. Grieve (No longer online)

Slang (1 matching dictionary)

19. Ferns: Urban Dictionary

(Note: See fern as well.)

Definitions from Wikipedia (Ferns) ▸ noun:  plants of the class Polypodiopsida. Opposite: non-fern, non-vascular plant, angiosperm, gymnosperm Types: maidenhair, bracken, sword, lady fern, Christmas fern, more... Phrases: tree ferns, seed ferns, giant ferns, maidenhair ferns, sword ferns, more... Adjectives: tree, many, giant, tall, green, true, delicate, few, small, large, beautiful ▸ Words similar to ferns ▸ Usage examples for ferns ▸ Idioms related to ferns ▸ Wikipedia articles (New!) ▸ Popular adjectives describing ferns ▸ Words that often appear near ferns ▸ Rhymes of ferns ▸ Invented words related to ferns