King James Bible

BIRTH'RIGHT, noun [birth and right.] Any right or privilege, to which a person is entitled by birth, such as an estate descendible by law to an heir, or civil liberty under a free constitution.

Esau, for a morsel, sold his birthright Hebrews 12:16.

It may be used in the sense of primogeniture, or the privilege of the first born, but is applicable to any right which results from descent.

BIRTH'-SONG, noun A song sung at the birth of a person.

BIRTH'-STRANGLED, adjective [birth and strangle.] Strangled or suffocated in being born.