Definition of "grandnephew" [grand•neph•ew]

• A son of one's nephew or niece. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Drawing from handwritten notes by Bram Stoker, the horror author’s great-grandnephew is set to pen a Dracula sequel entitled Dracula: The Un-Dead."
• "Aunt Hetty Vanderveer who was queer and going on to eighty, who couldn't live with a relative for they always wanted to borrow her money, got tangled up in a house on which she had a mortgage, and called her grandnephew, Mr. John Borden to her rescue."
• ""You seem to forget that I am her nephew that is, her grandnephew."