Sorry, no online dictionaries contain the exact phrase percentage of the speed of light.

Reverse dictionary results:
1. refractive index
2. sensitivity
3. cruiser
4. spectrophotometer
5. lightspeed
6. relativistic
7. foucault
8. light speed
9. rapidity
10. speed of light
11. superluminal
12. tachyon
13. formula
14. jean bernard leon foucault
15. light time
16. neutrino
17. rates
18. hold
19. rate
20. average
21. slip
22. slipped
23. slipping
24. slips
25. coverage
26. prevalence
27. efficiency
28. apportionment
29. discount
30. interest
31. respects
32. cut
33. exposure
34. flash
35. turn
36. turned
37. broadband
38. buzzing
39. flow
40. overnight

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You can look up the words in the phrase individually using these links:   percentage ?   of ?   the ?   speed ?   of ?   light ?
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