Sorry, no online dictionaries contain the exact phrase proof of origin.
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Reverse dictionary results:
1. pull
 2. authentication
3. scalp
4. thomas
5. adduce
6. adducer
7. alibi
8. analysis
9. appeal
10. approve
 11. approved
12. argument
13. assay
14. blind
15. blinds
16. bond
17. brand
18. bring
19. bringing
20. cancel
 21. card
22. caret
23. check
24. checking
25. cite
26. cognizance
27. conviction
28. corroborated
29. credulity
30. dele
 31. demonstrate
32. demonstration
33. demonstrative
34. direct
35. dna
36. document
37. empirical
38. ergo
39. evidence
40. evidential

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You can look up the words in the phrase individually using these links:   proof ?   of ?   origin ?
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Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
proo*to search for words beginning with proo, or
*iginto search for words ending with igin
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