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great-grandfather

[greyt-gran-fah-th er, -grand-]
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noun
  1. a grandfather of one's father or mother.

Origin of great-grandfather

First recorded in 1505–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for great-grandfather

n.

1510s, from great + grandfather.

Online Etymology Dictionary, © 2010 Douglas Harper