nibling

American  

[nib-ling] / ˈnɪb lɪŋ /

1. a child of one’s sibling, such as a niece or nephew, especially used in the plural or as a gender-neutral term: My nibling started their new job last week.

   I generally get along with kids quite well—my niblings ask me to play whenever I visit my sister.

   My nibling started their new job last week.

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Etymology

Origin of nibling

n(ephew) ( def. ) or n(iece) ( def. ) + (s)ibling ( def. ); coined by U.S. linguist Samuel E. Martin (1924–2009) in 1951