Sorry, no online dictionaries contain the exact phrase actinide expansion.
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Reverse dictionary results:
1. uranium
2. lanthanide
3. americium
4. actinium
5. actinon
6. atomic number 89
7. berkelium
8. neptunium
9. nobelium
10. plutonium
11. thorium
12. actinides
13. curium
14. acolytes
15. apocalypses
16. asteroids
17. basilicas
18. betrayals
19. binders
20. bivalent
21. blues
22. burglaries
23. cases
24. characters
25. colds
26. complaints
27. constellations
28. cracks
29. culprits
30. cycles
31. delinquencies
32. dental
33. diatomic
34. divalent
35. electronegative
36. electropositive
37. hydrogenic
38. isoelectronic
39. monatomic
40. non-actinide

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You can look up the words in the phrase individually using these links:   actinide ?   expansion ?
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