Adjective surrogate has 1 sense
  1. foster, surrogate - providing or receiving nurture or parental care though not related by blood or legal ties; "foster parent"; "foster child"; "foster home"; "surrogate father"
    Antonym: biological (indirect, via adoptive)
,Noun surrogate has 2 senses
  1. surrogate, alternate, replacement - someone who takes the place of another person
    --1 is a kind of stand-in, substitute, relief, reliever, backup, backup man, fill-in
  2. deputy, surrogate - a person appointed to represent or act on behalf of others
    --2 is a kind of agent
    --2 has particulars: vicegerent