great-niece
/G R EY1 T N IY0 S/noun
- 1
A granddaughter of one's sibling; a daughter of one's nephew or niece. (Brother's granddaughter: fraternal grandniece. Sister's granddaughter: sororal grandniece.)
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Source: https://en.wiktionary.org/wiki/grandniece, https://en.wiktionary.org/wiki/great-niece