- a son of one's nephew or niece; grandson of one's brother or sister
WordReference Random House Unabridged Dictionary of American English © 2026
great-neph•ew
(grāt′nef′yo̅o̅, -nev′yo̅o̅),USA pronunciation n.
- a son of one's nephew or niece;
grandnephew.
- 1575–85
Collins Concise English Dictionary © HarperCollins Publishers::
great-nephew, grandnephew n
'great-nephew' also found in these entries (note: many are not synonyms or translations):