English
great-grandaunt
From great- + grandaunt.
Formed from great- + grandaunt
Proto-Indo-European *gʰrewd- ‘to rub, grind, remove’
Proto-Germanic *grautaz ‘coarse, crude’
Proto-West Germanic *graut
Old English grēat ‘big’
Middle English grete ‘great’
English great-
Today it means
noun An aunt of one's grandparent (i.e. a sister or sister-in-law of one's great-grandparent)
Language periods are conventional ranges, not dates for this word.
Etymograph / great-grandaunt