Is there a verse in the bible that specifically prohibits abortion...or considers the aborting of an unborn fetus as murder?
I know that there will be others that may may interpret these differently than I do, but here are some of the more straight forward verses that I have found, that point towards a protection of the unborn.
Psamlms 139:
13. For thou hast possessed my reins: thou hast covered me in my mother's womb.
14. I will praise thee; for I am fearfully and wonderfully made: marvellous are thy works; and that my soul knoweth right well.
15. My substance was not hid from thee, when I was made in secret, and curiously wrought in the lowest parts of the earth.
16. Thine eyes did see my substance, yet being unperfect; and in thy book all my members were written, which in continuance were fashioned, when as yet there was none of them.
Jeremiah 1:
4. Then the word of the LORD came unto me, saying,
5. Before I formed thee in the belly I knew thee; and before thou camest forth out of the womb I sanctified thee, and I ordained thee a prophet unto the nations.
Isaiah 49:
1. Listen, O isles, unto me; and hearken, ye people, from far; The LORD hath called me from the womb; from the bowels of my mother hath he made mention of my name.
5. And now, saith the LORD that formed me from the womb to be his servant, to bring Jacob again to him, Though Israel be not gathered, yet shall I be glorious in the eyes of the LORD, and my God shall be my strength.
Genesis 25:
22. And the children struggled together within her; and she said, If it be so, why am I thus? And she went to inquire of the LORD.
23. And the LORD said unto her, Two nations are in thy womb, and two manner of people shall be separated from thy bowels; and the one people shall be stronger than the other people; and the elder shall serve the younger.
Romans 9:
10. And not only this; but when Rebecca also had conceived by one, even by our father Isaac;
11. For the children being not yet born, neither having done any good or evil, that the purpose of God according to election might stand, not of works, but of him that calleth
Exodus 21:
22. If men strive, and hurt a woman with child, so that her fruit depart from her, and yet no mischief follow: he shall be surely punished, according as the woman's husband will lay upon him; and he shall pay as the judges determine.
23. And if any mischief follow, then thou shalt give life for life,
Is this the type of thing that you are refering too? As I said, there are others that I personally look at that have more to do with my life belonging to God, Christian commanded to love and other doctinal issues that tie in, but I think that these more adequately answer your query. Please let me know if you are looking for something else and I will try to find it.