Sorry, no online dictionaries contain the exact phrase pi theory.
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Reverse dictionary results:
1. area
2. constant
3. eta
4. greek
5. tail
6. tracer
7. physics
8. rat
9. holmes
10. mechanism
11. scheme
12. section
13. system
14. take
15. active
16. agent
17. aide
18. also
19. anna
20. article
21. astute
22. bond
23. care
24. case
25. cia
26. clause
27. clue
28. cover
29. covers
30. deduce
31. deductive
32. device
33. editor
34. effect
35. effective
36. fancy
37. fed
38. force
39. forces
40. functional

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