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We found 43 dictionaries with English definitions that include the word twin:
Click on the first link on a line below to go directly to a page where "twin" is defined.

General (29 matching dictionaries)

1. twin: Merriam-Webster.com [home, info]
2. twin, twin: Oxford Learner's Dictionaries [home, info]
3. twin: American Heritage Dictionary of the English Language [home, info]
4. twin: Collins English Dictionary [home, info]
5. Twin, twin: Vocabulary.com [home, info]
6. twin, twin, twin: Macmillan Dictionary [home, info]
7. Twin, twin: Wordnik [home, info]
8. twin: Cambridge Advanced Learner's Dictionary [home, info]
9. Twin, twin: Wiktionary [home, info]
10. twin: Webster's New World College Dictionary, 4th Ed. [home, info]
11. twin: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. twin: Infoplease Dictionary [home, info]
13. twin: Dictionary.com [home, info]
14. twin (adj.): Online Etymology Dictionary [home, info]
15. Twin, twin: UltraLingua English Dictionary [home, info]
16. twin: Cambridge Dictionary of American English [home, info]
17. The Twin (EP), The Twin (album), The Twin (disambiguation), The Twin (novel), Twin (TV series), Twin (disambiguation), Twin (production team), Twin (windowing system), Twin: Wikipedia, the Free Encyclopedia [home, info]
18. Twin: Online Plain Text English Dictionary [home, info]
19. twin: Webster's Revised Unabridged, 1913 Edition [home, info]
20. Twin: Rhymezone [home, info]
21. twin: AllWords.com Multi-Lingual Dictionary [home, info]
22. twin: Webster's 1828 Dictionary [home, info]
23. twin: Free Dictionary [home, info]
24. twin: Mnemonic Dictionary [home, info]
25. twin: WordNet 1.7 Vocabulary Helper [home, info]
26. Twin, twin: LookWAYup Translating Dictionary/Thesaurus [home, info]
27. twin: Dictionary/thesaurus [home, info]

Business (2 matching dictionaries)

28. twin: Travel Industry Dictionary [home, info]
29. Twin (Biological), twin: Legal dictionary [home, info]

Computing (1 matching dictionary)

30. Twin (Biological), twin: Encyclopedia [home, info]

Medicine (5 matching dictionaries)

31. Twin: MedTerms.com Medical Dictionary [home, info]
32. Twin: MedFriendly Glossary [home, info]
33. twin: online medical dictionary [home, info]
34. Twin (Biological), twin: Medical dictionary [home, info]
35. Twin: Drug Medical Dictionary [home, info]

Miscellaneous (2 matching dictionaries)

36. TWIN: Acronym Finder [home, info]
37. TWIN: AbbreviationZ [home, info]

Science (1 matching dictionary)

38. Twin: Eric Weisstein's World of Chemistry [home, info]

Slang (2 matching dictionaries)

39. twin: The Folk File [home, info]
40. twin, the twin: Urban Dictionary [home, info]

Tech (1 matching dictionary)

41. Twin: AUTOMOTIVE TERMS [home, info]

(Note: See twinship for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (Twin) ▸ noun:  a waterfall in the Snake River in southern Idaho ▸ noun:  either of two offspring born at the same time from the same pregnancy ▸ noun:  (astrology) a person who is born while the sun in in Gemini ▸ noun:  a duplicate copy ▸ verb:  grow as twins ("Twin crystals") ▸ verb:  duplicate or match ("The polished surface twinned his face and chest in reverse") ▸ verb:  give birth to twins ▸ verb:  bring two objects, ideas, or people together ▸ adjective:  very similar ▸ Also see twinship ▸ Word origin ▸ Words similar to twin ▸ Usage examples for twin ▸ Idioms related to twin (New!) ▸ Popular adjectives describing twin ▸ Popular nouns described by twin ▸ Words that often appear near twin ▸ Rhymes of twin ▸ Invented words related to twin