surrogate mother(n = noun.person) - a woman who bears a child for a couple where the wife is unable to do so; "a surrogate mother is artificially inseminated with the father's semen and carries the fetus to term"
is a kind of female parent, mother

1.  a person or who serves in place of the biological mother for child, as for caring or nurturing. [PJC]

2.  a female animal that raises and nurses the offspring of another animal. [PJC]

3.  a woman who becomes pregnant by an artificial procedure (one other than copulation), and bears a child to be raised by another person. The person on whose behalf the child is gestated and born is usually one of the biological parents. The embryo carried by the surrogate mother may be created by in vitro fertilization, and may have no genetic material from the surrogate mother, or the surrogate mother may be impregnated by artificial insemination, usually by sperm donated by the father who is to raise the child.
"The procedure is common but controversial, and in some states of the United States, contracts for surrogacy are not considered enforceable." [PJC]

den mother, earth mother, father surrogate, foster mother, great mother, mother, mother board, mother carey's chicken, mother carey's hen, mother cell, mother country, mother figure, mother fucker, mother goose, mother hen, mother hubbard, mother jones, mother lode, mother of god, mother of thyme, mother seton, mother superior, mother teresa, mother theresa, mother tongue, mother wit, queen mother, spore mother cell, surrogate