Sorry, no online dictionaries contain the exact phrase nuclear lifetime.
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Reverse dictionary results:
1. age
 2. resonance
3. unstable
4. being
5. day
6. durability
7. duration
8. forever
9. generation
10. length
 11. living
12. long
13. mean life
14. single
15. term
16. time
17. timed
18. timing
19. burn
20. containment
 21. energy
22. era
23. family
24. fermi
25. fermium
26. gigaton
27. hadron
28. isomer
29. kiloton
30. megaton
 31. meson
32. overkill
33. rad
34. supernova
35. uranium
36. war
37. fluorescence
38. mlf
39. nuclear bomb
40. strong interaction

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You can look up the words in the phrase individually using these links:   nuclear ?   lifetime ?
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