We found 19 dictionaries that define the word sires:

General (11 matching dictionaries)

1. sires: Merriam-Webster
2. sires: Collins English Dictionary
3. sires: Vocabulary.com
4. Sire's, Sires, sire's, sires, sires: Wordnik
5. sires: Cambridge Advanced Learner's Dictionary
6. sires: Wiktionary
7. sires: Dictionary.com
8. sires: Cambridge Essential American English Dictionary
9. Sires: Wikipedia, the Free Encyclopedia
10. Sires: Rhymezone
11. sires: TheFreeDictionary.com

Business (2 matching dictionaries)

12. Derivatives (No longer online)
13. sires: Legal dictionary

Computing (1 matching dictionary)

14. sires: Encyclopedia

Medicine (2 matching dictionaries)

15. sires: Merriam-Webster Medical Dictionary
16. sires: Medical dictionary

Miscellaneous (1 matching dictionary)

17. SIRES: Acronym Finder

Science (1 matching dictionary)

18. Agricultural Thesaurus and Glossary (No longer online)

Slang (1 matching dictionary)

19. Sires: Urban Dictionary

(Note: See sire as well.)

Definitions from WordNet (Sires) ▸ name:  A surname (very rare: popularity rank in the U.S.: #21231) Opposite: dams, matrons, mothers Phrases: Albio Sires, more... Adjectives: noble, purebred, great, good, bred, revolutionary, different, young, superior, aged, outstanding ▸ Words similar to sires ▸ Usage examples for sires ▸ Idioms related to sires ▸ Wikipedia articles (New!) ▸ Words that often appear near sires ▸ Rhymes of sires ▸ Invented words related to sires