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Noun: grandkid  'grand,kid
Usage: N. Amer, informal (elsewhere: grandchild)
  1. A child of one's son or daughter
    "The proud grandparents doted on their new grandkid";
    - grandchild, oe [UK, dialect]

Derived forms: grandkids

Type of: issue [formal], offspring, progeny

Encyclopedia: Grandkid