Sorry, no online dictionaries contain the exact phrase heaviest isotope.
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Reverse dictionary results:
1. radon
2. heavy
3. astatine
4. uranium
5. gold
6. atomic number 85
7. fermium
8. iodine-131
9. lawrencium
10. neptunium
11. nobelium
12. plutonium
13. protactinium
14. seaborgium
15. technetium
16. thorium
17. urey
18. protium
19. atom bomb
20. atomic number 92
21. azide
22. chlorite
23. chromium
24. periodate
25. radioactivity
26. transuranic
27. uraninite
28. actinium
29. atom
30. berkelium
31. bismuth
32. carbon
33. seeded
34. tritium
35. deuterium
36. amphibole
37. background
38. beta
39. blanket
40. blue

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You can look up the words in the phrase individually using these links:   heaviest ?   isotope ?
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