Definition of "foster-son" [foster-son]

• A male child nourished or reared like an own son, though not such by birth. (noun)

The Century Dictionary (Public Domain)

• "And then he sat on the bed and we had a nice little chat, uncle and nephew, foster-father to foster-son."
• "Jamieson, — her menial situation, and her excessive partiality for her foster-son, considered, — altogether such a matron as could afford her protection."
• "In another Irish legend, Diarmait mac Cerbaill, king of all Ireland, is killed by his foster-son Aed Dub by drowning, burning and stabbing see Wikipedia."