grandnephew

[ gran-nef-yoo, -nev-yoo, grand- ]
/ ˈgrænˌnɛf yu, -ˌnɛv yu, ˈgrænd- /

noun

a son of one's nephew or niece.

Origin of grandnephew

First recorded in 1630–40; grand- + nephew
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for grandnephew

grandnephew

/ (ˈɡrænˌnɛvjuː, -ˌnɛfjuː, ˈɡrænd-) /

noun

another name for great-nephew
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012