great-nephew

 /ˈgreɪtˌnefjuː/


WordReference Random House Unabridged Dictionary of American English © 2015
great-neph•ew  (grātnef′yo̅o̅, -nev′yo̅o̅), 
n. 

    a son of one's nephew or niece;
    grandnephew.
Etymology:1575–85


Collins Concise English Dictionary © HarperCollins Publishers::

great-nephew, grandnephew n
  1. a son of one's nephew or niece; grandson of one's brother or sister



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