Sorry, no online dictionaries contain the exact phrase heart efficiency.
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Reverse dictionary results:
1. set
2. insufficiency
3. man
4. cost
5. effect
6. effected
7. effecting
8. force
9. yield
10. affect
11. assault
12. base
13. basis
14. bond
15. breast
16. cardiac
17. cardiograph
18. cardiology
19. central
20. condition
21. conditions
22. coo
23. courage
24. dearness
25. essence
26. feeling
27. full
28. gold
29. hack
30. heart attack
31. hearts
32. hollow
33. home
34. key
35. kind
36. love
37. magnanimity
38. mettle
39. mind
40. murmur

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You can look up the words in the phrase individually using these links:   heart ?   efficiency ?
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