Sorry, no online dictionaries contain the exact phrase M33 X-7.
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Reverse dictionary results:
1. binary black hole
 2. black widow pulsar
3. beta centauri
4. atlas
5. ogle-2011-blg-0462
6. eblm j0555-57
7. cygnus x-3
8. alcor
9. sagittarius a*
10. 3c 321
 11. 70 ophiuchi
12. sagittarius a
13. circinus galaxy
14. ngc 7320
15. abell 3266
16. stellar black hole
17. ngc 604
18. hd 106906
19. arp 273
20. large magellanic cloud
 21. groombridge 34
22. hd 16760
23. kic 9832227
24. rho ophiuchi
25. triangulum galaxy
26. homunculus nebula
27. sagittarius a* cluster
28. perseus cluster
29. ngc 6357
30. gamma aquarii
 31. ngc 6638
32. great annihilator
33. messier 74
34. binary pulsar
35. ngc 4889
36. ar scorpii
37. ngc 300
38. bullet cluster
39. kepler-36b
40. epsilon cygni

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You can look up the words in the phrase individually using these links:   m33 ?   x-7 ?
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