Sorry, no online dictionaries contain the exact phrase unsolved problems in biology.
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Reverse dictionary results:
1. poison
 2. technologist
3. heuristic
4. settlement
5. solving
6. test
7. bioengineering
8. domain
9. evolution
10. pigment
 11. reduce
12. reduced
13. field
14. hard
15. planktonic
16. family
17. flied
18. oceanic
19. oil
20. position
 21. rover
22. class
23. fix
24. float
25. processing
26. state
27. abortive
28. cup
29. cupped
30. cups
 31. display
32. divide
33. herm
34. key
35. keying
36. keys
37. name
38. names
39. naming
40. neuter

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You can look up the words in the phrase individually using these links:   unsolved ?   problems ?   in ?   biology ?
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Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
unso*to search for words beginning with unso, or
*logyto search for words ending with logy
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