Wiktionary
adoptive mother
n. A woman who has adopted a child, as opposed to a biological mother.
Usage examples of "adoptive mother".
He did not respond to Flinx's brief allusion to his adoptive mother's past.
Then he saw the smile of his adoptive mother and he threw himself in his arms.
She couldn't find a scrap of information about her family after her adoptive mother's death.
He did not go near the room he had once occupied himself, nor the room that had confined his adoptive mother in the months before her death.
She had an adoptive father whom she respected, an adoptive mother whom she loved, an older brother whom she worshiped, and an indulgent godfather whom she adored.