Sorry, no online dictionaries contain the exact phrase optical binaries.
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Reverse dictionary results:
1. double star
2. binary star
3. busbar
4. capella
5. rigel
6. spica
7. visual binary
8. field
9. inversion
10. aldebaran
11. algol
12. alpha centauri
13. antares
14. base
15. bin
16. bits
17. block
18. character
19. code
20. complement
21. dichotomous
22. dual
23. halide
24. inverse
25. mira
26. mizar
27. one
28. pair
29. polaris
30. procyon
31. regulus
32. ring
33. scale
34. secondary
35. sensitivity
36. set
37. shift
38. sirius
39. star
40. theorem

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