One's female child. A female descendant. A woman considered as if in a relationship of child to parent: a daughter of the nation. One personified or regarded as a female descendant: "Culturally Japan is a daughter of Chinese civilization\u201d ( Edwin O. Reischauer). Physics The immediate product of the radioactive decay of an element. Possessing the characteristics of a daughter; having the relationship of a daughter. Biology Of or relating to a cell, organelle, or other structure produced by division or replication: daughter cell; daughter DNA. Physics Produced by or resulting from the decay of a radioactive element: daughter atom; daughter nuclide.