saviour sibling

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saviour sibling (plural saviour siblings)

  1. A child, conceived by selected IVF treatment, so as to have compatible tissue that could be used to treat an existing sick brother or sister
    • 2008, Nicholas Watt, The Guardian, 20 May 2008:
      MPs pushed back the boundaries of science last night when they voted to allow the creation of hybrid embryos, which have a combination of human and animal DNA, as well as "saviour siblings" to save sick children.