Sorry, no online dictionaries contain the exact phrase sludge theory.
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Reverse dictionary results:
1. dirt
2. ice
3. slush
4. isis
5. bernoulli
6. copernican
7. gnome
8. panspermia
9. plate
10. salamander
11. subscribe
12. subscribed
13. uniformitarianism
14. vegetarianism
15. aristarchus of samos
16. continental drift
17. copernican system
18. copernicus
19. geocentric
20. geocentrical
21. geogony
22. heliocentrism
23. plate tectonics
24. amphibology
25. antecedent
26. buck
27. bulwark
28. catastrophism
29. chiliasm
30. clear
31. cleared
32. conceive
33. conceiving
34. coprology
35. cytoplasm
36. earth mother
37. earthly
38. exobiology
39. filter
40. force

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You can look up the words in the phrase individually using these links:   sludge ?   theory ?
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