Definition of grandchild noun from the Oxford Advanced American Dictionary

  

grandchild

 noun
noun
NAmE//ˈɡræntʃaɪld//
 
(pl. grandchildren
NAmE//ˈɡrænˌtʃɪldrən//
 
)
 
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 a child of your son or daughter
See the Oxford Advanced Learner's Dictionary entry: grandchild