surrogate surrogate /ˈsɝːəˌgeɪt/

adjective

1. Providing or receiving nurture or parental care though not related by blood or legal ties  ( foster , surrogate )
   providing or receiving nurture or parental care though not related by blood or legal ties
    Foster parent
   foster parent
    Foster child
   foster child
    Foster home
   foster home
    Surrogate father
   surrogate father
   

noun

1. A person appointed to represent or act on behalf of others  ( deputy , surrogate )
   a person appointed to represent or act on behalf of others
   
2. Someone who takes the place of another person  ( alternate , surrogate , replacement )
   someone who takes the place of another person