English word granddaughter comes from English daughter, English grand- (Of a generation removed from the original noun.)

Detailed word origin of granddaughter

Dictionary entry	Language	Definition
daughter	English (eng)	(physics) A nuclide left over from radioactive decay.. A daughter language.. A female descendant.. One’s female offspring.
grand-	English (eng)	Of a generation removed from the original noun.
granddaughter	English (eng)	The daughter of someone's child.

Words with the same origin as granddaughter