- a girl raised like one's own daughter, though not such by birth or adoption.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for foster daughter
"Thou dost great honour, earl, to my foster-daughter and my house," he said.Eric Brighteyes
H. Rider Haggard
It was but right that he should ask M. Destournier for his foster-daughter.A Little Girl in Old Quebec
Amanda Millie Douglas
It was rediscovered by old Rosendo, and the title transferred to his foster-daughter.Carmen Ariza
Charles Francis Stocking
Fierce and angry did he look, as, high above his foster-daughter, he held his magic wand.
Undine, the foster-daughter of a good old fisherman and his wife, is a water nymph, and as such is born without a soul.