Sorry, no online dictionaries contain the exact phrase involuntary reaction.
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Reverse dictionary results:
1. reflex
2. spasm
3. twitch
4. convulsion
5. contraction
6. stir
7. sally
8. upbraid
9. boutade
10. drown out
11. rash
12. rouse
13. crush
14. onrushing
15. onslaught
16. outweep
17. upheaving
18. inrush
19. inrushing
20. onrush
21. rush
22. sprain
23. upcast
24. adrenalin rush
25. bestir
26. bum rush
27. concussion
28. outdazzle
29. rile up
30. rushed
31. rushing
32. thrust
33. upheaval
34. agitate
35. excite
36. face down
37. fill up
38. fillip

You can look up the words in the phrase individually using these links:   involuntary ?   reaction ?
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