Sorry, no online dictionaries contain the exact phrase lightless reactor.
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Reverse dictionary results:
1. inky
 2. lit
3. aphotic
4. ponderous
5. rayless
6. airless
7. cheerless
8. dank
9. dark
10. darkened
 11. darksome
12. dim
13. draughty
14. enchanted
15. gloomy
16. haunted
17. illuminated
18. invisible
19. light
20. subterranean
 21. sunless
22. sunlit
23. tenebrous
24. twilit
25. unilluminated
26. unlighted
27. unlit
28. unseeable
29. well-lit
30. windowless
 31. absorber
32. advanced gas-cooled reactor
33. afterheat
34. atom
35. atomic
36. atomic pile
37. atomic reactor
38. beam hole
39. bioreactor
40. blanket

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You can look up the words in the phrase individually using these links:   lightless ?   reactor ?
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