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We found 52 dictionaries with English definitions that include the word decay:
Click on the first link on a line below to go directly to a page where "decay" is defined.

General (29 matching dictionaries)

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

Art (1 matching dictionary)

28. Decay: Virginia Tech Multimedia Music Dictionary [home, info]

Business (3 matching dictionaries)

29. Decay: Glossary of Health Care Terms [home, info]
30. Decay: Construction Term Glossary [home, info]
31. decay: Legal dictionary [home, info]

Computing (3 matching dictionaries)

32. decay: Free On-line Dictionary of Computing [home, info]
33. Decay: Game Dictionary [home, info]
34. decay: Encyclopedia [home, info]

Medicine (2 matching dictionaries)

35. decay: online medical dictionary [home, info]
36. decay: Medical dictionary [home, info]

Miscellaneous (2 matching dictionaries)

37. Decay: Brilliant Dream Dictionary [home, info]
38. decay: Idioms [home, info]

Science (5 matching dictionaries)

39. -Decay, Decay: Extragalactic Astronomy [home, info]
40. DECAY: Cytokines & Cells Online Pathfinder Encyclopaedia [home, info]
41. decay: UNCChem Glossary [home, info]
42. Decay: Accelerator Glossary [home, info]
43. Decay: Underwater Archaeology Glossary [home, info]

Slang (1 matching dictionary)

44. Decay: Urban Dictionary [home, info]

Tech (6 matching dictionaries)

45. Decay: AUTOMOTIVE TERMS [home, info]
46. decay: Glossary of Meteorology [home, info]
47. DECAY: Lake and Water Word Glossary [home, info]
48. decay: Rane Professional Audio Reference [home, info]
49. Decay: Sweetwater Music [home, info]
50. Decay: Nuclear Terms [home, info]

(Note: See decays for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (decay) ▸ noun:  the organic phenomenon of rotting ▸ noun:  a gradual decrease; as of stored charge or current ▸ noun:  the process of gradually becoming inferior ▸ noun:  the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation ▸ noun:  an inferior state resulting from the process of decaying ("The corpse was in an advanced state of decay") ▸ verb:  undergo decay or decomposition ("The body started to decay and needed to be cremated") ▸ verb:  fall into decay or ruin ("The unoccupied house started to decay") ▸ verb:  lose a stored charge, magnetic flux, or current ▸ Also see decays ▸ Word origin ▸ Words similar to decay ▸ Usage examples for decay ▸ Idioms related to decay (New!) ▸ Popular adjectives describing decay ▸ Words that often appear near decay ▸ Rhymes of decay ▸ Invented words related to decay