Sorry, no online dictionaries contain the exact phrase principal cause.
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Reverse dictionary results:
1. leading
 2. leafing
3. campylobacter
4. anchor
5. banner
6. basis
7. blood
8. bloods
9. burden
10. center
 11. come
12. double
13. down
14. face
15. focus
16. fountain
17. from
18. frome
19. grom
20. ground
 21. grounded
22. gun
23. guns
24. head
25. heart
26. hero
27. hold
28. job
29. keel
30. key
 31. keying
32. keys
33. lead
34. line
35. mainspring
36. object
37. origin
38. parent
39. point
40. principle

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You can look up the words in the phrase individually using these links:   principal ?   cause ?
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