grand daughter, 孫女/ 外孫女

Former U.S. President George W. Bush and his wife Laura pose with their new grand daughter Poppy Louise (R) and her sister Mila Hager, after their daughter Jenna Bush Hager gave birth in New York in a photo provided by the Office of George W. Bush.
August 14, 2015
http://www.voanews.com/media/photogallery/day-in-photos-august-14-2015/2918090.html

granddaughter是什么意思 - 听力课堂在线翻译

n.（外）孙女