Sorry, no online dictionaries contain the exact phrase superluminal speed.
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Reverse dictionary results:
1. tesseract
2. relativistic
3. interplanetary
4. advective
5. acoustic
6. brownian
7. compressional
8. diffusive
9. excitation
10. extraterrestrial
11. geostrophic
12. hydromagnetic
13. intercellular
14. multipath
15. nonperiodic
16. nonresonant
17. nonstationary
18. nonthermal
19. oscillatory
20. subatomic
21. able
22. accelerando
23. accelerate
24. accelerated
25. accelerates
26. accelerating
27. acceleration
28. accelerator
29. active
30. ahead
31. airbrake
32. airspeed
33. alacrity
34. amain
35. ammeter
36. amplitude
37. andante
38. anemograph
39. anemometer
40. anemometric

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