Sorry, no online dictionaries contain the exact phrase thorium fission.
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Reverse dictionary results:
1. francium
2. ray
3. thoron
4. atom bomb
5. hahn
6. meitner
7. promethium
8. fuel
9. plutonium
10. uranium 238
11. atom
12. pile
13. fast neutron
14. asian
15. ore
16. radioactivity
17. series
18. uranium
19. cadmium
20. silicon
21. vanadium
22. astatine
23. protactinium
24. thorianite
25. curie
26. ionium
27. mesothorium
28. monazite
29. radiothorium
30. thoria
31. thoriate
32. thoric
33. thorite
34. thorium-228
35. thorium series
36. welsbach burner
37. 20th
38. 50th
39. 5th
40. 7th

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You can look up the words in the phrase individually using these links:   thorium ?   fission ?
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