Sorry, no online dictionaries contain the exact phrase fossil hydrogen.
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Reverse dictionary results:
1. gas
2. fossil fuel
3. synthetic fuel
4. -ite
5. alveolus
6. carbon
7. fuel
8. gaa
9. gasoline
10. natural gas
11. petroleum
12. resin
13. acetamide
14. alkane
15. combustion
16. anthracite
17. diaspore
18. fuel cell
19. goethite
20. acidophil
21. acidophile
22. aerobe
23. aerobic
24. anaerobe
25. anaerobic
26. anthracene
27. aqua fortis
28. bacillus
29. biphenyl
30. boric acid
31. brushite
32. butane
33. carburation
34. cerotic acid
35. cetane
36. coal oil
37. cordierite
38. eikosane
39. essential
40. ethanamide

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You can look up the words in the phrase individually using these links:   fossil ?   hydrogen ?
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