Sorry, no online dictionaries contain the exact phrase to know by heart.
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Reverse dictionary results:
1. unfathomable
 2. unknowable
3. unknown
4. abdomen
5. about
6. absence
7. abundance
8. accommodation
9. ace
10. ache
 11. acsad
12. adore
13. adored
14. adrenaline
15. affect
16. akron
17. alabama
18. all
19. alone
20. alva
 21. amaranth
22. amie
23. angina
24. angina pectoris
25. animosity
26. ankara
27. ann
28. annual
29. aorta
30. aortic
 31. arcadia
32. aria
33. arrow
34. arteria coronaria
35. arteriosclerosis
36. artichoke
37. artificial heart
38. aspirin
39. assault
40. asystole

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