Definitions

1. noun

A child whose parent is deceased or otherwise absent, particularly a child of a female who has been widowed.

“As a widow, she struggled to raise her two undaughters on her own.”

2. noun

A person, especially a child, who is not acknowledged or recognized as a legitimate member of a family or household.

“The undaughter was a product of her mother’s affair, and she struggled with her identity for years.”