the.com/surrogate mother

means A woman who carries and delivers a baby on behalf of another person or couple, who will become the child's legal parent(s).

from From Latin surrogatus, past participle of surrogare — 'to substitute, put in another's place' (sub- 'in place of' + rogare 'to ask, propose'). The legal and political sense of 'surrogate' as a substitute or deputy is centuries old — a surrogate judge, a surrogate parent in custody law — long before it attached to pregnancy. The medical pairing 'surrogate mother' is a 20th-century coinage, rising with the advent of reproductive technologies like IVF, which made it possible for one woman to carry a pregnancy on behalf of another.