The Collaborative International Dictionary
Foster \Fos"ter\, a. [AS. f[=o]ster, f[=o]stor, nourishment. See Foster, v. t.] Relating to nourishment; affording, receiving, or sharing nourishment or nurture; -- applied to father, mother, child, brother, etc., to indicate that the person so called stands in the relation of parent, child, brother, etc., as regards sustenance and nurture, but not by tie of blood. Foster babe or Foster child, an infant or child nursed or raised by a woman not its mother, or bred by a man not its father. Foster brother, Foster sister, one who is, or has been, nursed at the same breast, or brought up by the same nurse as another, but is not of the same parentage. Foster dam, one who takes the place of a mother; a nurse. --Dryden. Foster earth, earth by which a plant is nourished, though not its native soil. --J. Philips. Foster father, a man who takes the place of a father in caring for a child. --Bacon. Foster land.
Land allotted for the maintenance of any one. [Obs.]
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One's adopted country.
Foster lean [foster + AS. l[ae]n a loan See Loan.], remuneration fixed for the rearing of a foster child; also, the jointure of a wife. [Obs.]
--Wharton.Foster mother, a woman who takes a mother's place in the nurture and care of a child; a nurse.
Foster nurse, a nurse; a nourisher. [R.]
--Shak.Foster parent, a foster mother or foster father.
Foster son, a male foster child.
Wiktionary
n. An adult who cares for a child who has been placed in foster care.
Usage examples of "foster parent".
I walked down the four quiet, poorly lit streets back to my foster parent's apartment building, giving up the losing battle to shield myself from the downpour.
And after he'd left Sunderath, when his situation with Ansoain hadn't been so very different from Tiep's, he'd have died before risking the future with an untimely confession to his foster parent.
It's up in San Francisco and your foster parent is an engineer, just like you asked for.
She hadn't felt nervous at all yesterday when Elizabet had taken her downtown to complete the foster parent paperwork.