Sorry, no online dictionaries contain the exact phrase alternative energy source.
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Reverse dictionary results:
1. solar
2. atom
3. fuel
4. gas
5. oil
6. burn
7. cab
8. oilfield
9. sago
10. steam
11. quasar
12. glucose
13. decay
14. protein
15. soya
16. active
17. engine
18. power
19. radiation
20. reactor
21. supply
22. atomic energy
23. atomic power
24. plasma
25. principle
26. atp
27. carbohydrate
28. fat
29. fission
30. sol
31. sun
32. electromotive force
33. perpetual motion
34. biomass
35. emf
36. uranium
37. petroleum
38. coal
39. dynamo
40. miami

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You can look up the words in the phrase individually using these links:   alternative ?   energy ?   source ?
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