'Maid' in the Bible

But Abram said unto Sarai, Behold, thy maid is in thy hand; do to her that which is good in thine eyes. And Sarai dealt hardly with her, and she fled from her face.

And she said, Behold, my maid Bilhah, go in unto her; that she may bear upon my knees, and I also may obtain children by her.