What is the meaning of "al-Dha'r" (wet nurse), and what are the the jurisprudential rulings related to hiring her?

A wet nurse is a woman who breastfeeds a child who is not her own, and this entails certain legal rulings, including: the spread of mahramiyyah (prohibition of marriage) between her and the child she nursed, as well as her ascendants, descendants, and siblings; and the obligation to honor her and her relatives. If she is hired, she must fulfill the terms of her employment. She is considered a private contractor and a trustee, and is only liable in cases of negligence or transgression. The guardian of the nursed child must fulfill the agreement made with her.