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We found 32 dictionaries with English definitions that include the word proto:
Click on the first link on a line below to go directly to a page where "proto" is defined.

General (25 matching dictionaries)

1. proto-, proto, proto: Dictionary/thesaurus [home, info]
2. proto, Proto: LookWAYup Translating Dictionary/Thesaurus [home, info]
3. proto: WordNet 1.7 Vocabulary Helper [home, info]
4. proto: Mnemonic Dictionary [home, info]
5. proto-, proto: Free Dictionary [home, info]
6. proto-, proto: MyWord.info [home, info]
7. Proto-: AllWords.com Multi-Lingual Dictionary [home, info]
8. Proto: Rhymezone [home, info]
9. proto-: Webster's Revised Unabridged, 1913 Edition [home, info]
10. Proto-: Online Plain Text English Dictionary [home, info]
11. Proto, Proto (tools), Proto (magazine), Proto (Holly Herndon album), PROTO (fusion reactor): Wikipedia, the Free Encyclopedia [home, info]
12. proto: UltraLingua English Dictionary [home, info]
13. proto-: Online Etymology Dictionary [home, info]
14. proto-, proto, Proto-: Dictionary.com [home, info]
15. proto-: Infoplease Dictionary [home, info]
16. proto-: The Wordsmyth English Dictionary-Thesaurus [home, info]
17. proto-: Webster's New World College Dictionary, 4th Ed. [home, info]
18. proto-, proto, Proto: Wiktionary [home, info]
19. proto-: Cambridge Advanced Learner's Dictionary [home, info]
20. proto-, proto, Proto: Wordnik [home, info]
21. proto: Vocabulary.com [home, info]
22. proto-, proto-: Collins English Dictionary [home, info]
23. proto-: American Heritage Dictionary of the English Language [home, info]
24. proto-: Oxford Dictionaries [home, info]
25. proto-: Merriam-Webster.com [home, info]

Art (1 matching dictionary)

26. proto-: A Cross Reference of Latin and Greek Elements [home, info]

Medicine (2 matching dictionaries)

27. proto-, proto: Medical dictionary [home, info]
28. proto-: online medical dictionary [home, info]

Miscellaneous (2 matching dictionaries)

29. PROTO: AbbreviationZ [home, info]
30. PROTO: Acronym Finder [home, info]

Science (1 matching dictionary)

31. proto-: Archaeology Wordsmith [home, info]

Slang (1 matching dictionary)

32. Proto: Urban Dictionary [home, info]

Quick definitions from WordNet (Proto) ▸ name:  A surname (common: 1 in 100000 families; popularity rank in the U.S.: #17600) ▸ Word origin ▸ Words similar to proto ▸ Usage examples for proto ▸ Words that often appear near proto ▸ Rhymes of proto ▸ Invented words related to proto