Sorry, no online dictionaries contain the exact phrase rational brain.
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Reverse dictionary results:
1. idiot
2. intelligent
3. mind
4. reason
5. sanity
6. idea
7. intellect
8. intellectual
9. mindfulness
10. absurd
11. blind
12. figure
13. healthy
14. irrational
15. judicious
16. level
17. lucid
18. mental
19. noetic
20. nous
21. ratiocination
22. rationale
23. rationalism
24. rationality
25. reasonable
26. reasoned
27. responsible
28. sane
29. sensible
30. silly
31. skilful
32. sober
33. sobering
34. sophrosyne
35. sound
36. stable
37. talk
38. understanding
39. animal
40. argument

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