foster sister

American  

noun

1. a girl brought up with another child of different parents.

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Etymology

Origin of foster sister

First recorded in 1640–50

Example Sentences

When footage of Nazi soldiers appeared on television, Mr. Kertzer and his older sister, Ruth, would leap to switch the set off to protect their foster sister, Eva.

From New York Times • May 27, 2022

McLaughlin, who works at a therapeutic foster center, describes her 3-year-old grandson — who likes morning snuggle sessions and giggles with delight when his foster sister wakes from naps — as an “adrenaline junkie.”

From Washington Post • Jun. 30, 2017

The one successful, essential relationship Dexter has is with his bull-headed and passionate foster sister, Debra.

From New York Times • Sep. 17, 2010

There's oatmeal with bananas at breakfast, then preschool for Adam, 2, regular feedings for his one-year-old foster sister and bedtime stories when Dad returns from a long day at his telecommunications job.

From Time Magazine Archive

He thought of his foster sister Eva’s words.

From "Far from the Tree" by Robin Benway