Sorry, no online dictionaries contain the exact phrase in a flash of brilliance.
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Reverse dictionary results:
1. idea
2. coruscation
3. fire
4. flame
5. flamed
6. flashy
7. glare
8. glister
9. glitter
10. shine
11. sparkle
12. blink
13. coruscate
14. dazzlement
15. flashbulb
16. flashgun
17. flashing
18. flashlight
19. flick
20. flicker
21. flickering
22. flicking
23. fulgurant
24. glance
25. gleam
26. gleaming
27. glimmer
28. glimpse
29. glint
30. glisten
31. glittering
32. glitz
33. indicator
34. laser
35. leam
36. lighting
37. lightning
38. magnesium
39. photoflash
40. plash

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You can look up the words in the phrase individually using these links:   in ?   a ?   flash ?   of ?   brilliance ?
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