We found 28 dictionaries that define the word grains:

General (16 matching dictionaries)

1. grains: Merriam-Webster
2. grains: Collins English Dictionary
3. grains: Vocabulary.com
4. Grains, grain's, grains: Wordnik
5. grains: Cambridge Advanced Learner's Dictionary
6. grains: Wiktionary
7. grains: Infoplease Dictionary
8. grains: Dictionary.com
9. grains: Cambridge Essential American English Dictionary
10. Grains: Wikipedia, the Free Encyclopedia
11. Grains: Online Plain Text English Dictionary
12. grains: Webster's Revised Unabridged, 1913 Edition
13. Grains: AllWords.com Multi-Lingual Dictionary
14. grains: Webster's 1828 Dictionary
15. grains: FreeDictionary.org
16. Grains: TheFreeDictionary.com

Business (3 matching dictionaries)

17. Grains: bizterms.net
18. Comprehensive Financial (No longer online)
19. grains: Legal dictionary

Computing (1 matching dictionary)

20. grains: Encyclopedia

Medicine (3 matching dictionaries)

21. grains: Merriam-Webster Medical Dictionary
22. online medical dictionary (No longer online)
23. Grains: Medical dictionary

Miscellaneous (1 matching dictionary)

24. grains: Idioms

Science (1 matching dictionary)

25. Agricultural Thesaurus and Glossary (No longer online)

Slang (1 matching dictionary)

26. grains: Urban Dictionary

Tech (2 matching dictionaries)

27. Metal Terminology (No longer online)
28. Explosives (No longer online)

(Note: See grain as well.)

Definitions from Wiktionary (grains) ▸ noun:  Pigeons' dung used in tanning. See grainer. Similar: cereal, ingrain, granulate, caryopsis, food grain, metric grain, wheat, legume, rice, barley, more... Opposite: meats, fruits, vegetables, dairy, oils Types: wheat, corn, rice, oats, rye, barley, quinoa, millet, buckwheat, more... Phrases: pollen grains, whole grains, food grains, feed grains, rice grains, more... Adjectives: small, few, other, whole, large, individual, coarse, fine, rounded, pollen, tiny ▸ Words similar to grains ▸ Usage examples for grains ▸ Idioms related to grains ▸ Wikipedia articles (New!) ▸ Popular adjectives describing grains ▸ Words that often appear near grains ▸ Rhymes of grains ▸ Invented words related to grains