Sorry, no online dictionaries contain the exact phrase ultra-luminous x-ray source.
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Reverse dictionary results:
1. chest
2. radiation
3. radio
4. crystal
5. diffraction
6. irradiation
7. outreach
8. radius
9. ray
10. beams
11. cliche
12. coating
13. coatings
14. coverings
15. crystallographic
16. crystallography
17. fluoroscopic
18. fluoroscopy
19. gammray
20. infrared
21. non-fiction
22. radii
23. radiograph
24. radiographic
25. radiography
26. radiologic
27. radiological
28. radiology
29. rays
30. ultraviolet
31. visible light
32. x-rayed
33. x-raying
34. x-rays
35. x ray
36. aaa
37. ache
38. acidity
39. acknowledgment
40. acne

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