Sorry, no online dictionaries contain the exact phrase plutonium fission.
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Reverse dictionary results:
1. atom bomb
 2. atom
3. a-bomb
4. fuel
5. plutonium 239
6. hahn
7. meitner
8. promethium
9. uranium 238
10. critical
 11. pile
12. subcritical
13. fast neutron
14. agrees
15. aisle
16. allocation
17. along
18. articulate
19. atm
20. back
 21. bail
22. bak
23. band
24. bar
25. base
26. beacon
27. breach
28. breaching
29. break
30. cantonment
 31. car
32. caste
33. center
34. central
35. channel
36. channelling
37. channels
38. check
39. checking
40. church

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You can look up the words in the phrase individually using these links:   plutonium ?   fission ?
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plut*to search for words beginning with plut, or
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