Definition of saviour sibling noun from the Oxford Advanced Learner's Dictionary

 

saviour sibling

 noun
(also savior sibling)noun
BrE BrE//ˈseɪvjə sɪblɪŋ//
 
; NAmE NAmE//ˈseɪvjər sɪblɪŋ//
 
 
jump to other results
a child who is born through IVF in order to ensure that they have organs or cells that can be used to treat an older brother or sister with a serious medical condition