Sorry, no online dictionaries contain the exact phrase biological sibling.
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Reverse dictionary results:
1. twin
 2. cyst
3. evolution
4. heredity
5. inheritance
6. anthraquinone
7. arts
8. ase
9. biogenesis
10. blood
 11. blood brother
12. bloods
13. brotherly
14. carbene
15. colony
16. consanguineous
17. cust
18. dam
19. decuma
20. derive
 21. doppelganger
22. double
23. fairy
24. fraternal
25. gemma
26. half-blood
27. half-blooded
28. half-bred
29. half-breed
30. hybrid
 31. identical
32. image
33. imaging
34. inherit
35. isomer
36. lazarus
37. life peerage
38. mendicant
39. monk
40. morta

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You can look up the words in the phrase individually using these links:   biological ?   sibling ?
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Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
biol*to search for words beginning with biol, or
*lingto search for words ending with ling
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