thirdborn

adj

Born as the third child to parent or family. / Third of a particular type to be born to a parent or family.

She is the thirdborn child in her family.

意味（1）

Born as the third child to parent or family.

Mary, the thirdborn Bennett child in the novel Pride and Prejudice, receives the least attention.

意味（2）

Third of a particular type to be born to a parent or family.

Prince Arthur was Queen Victoria's thirdborn son and her seventh child overall.