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Noun: great grandchild
  1. A child of your grandson or granddaughter
Noun: great-grandchild (great-grandchildren)  'greyt'gran,chI(-u)ld
  1. The child of a grandson or granddaughter

Derived forms: great-grandchildren

Type of: grandchild, grandkid [N. Amer, informal], oe [UK, dialect]

Encyclopedia: Great grandchild