Esau, for a morsel, sold his birthright. Heb 12.
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, n. A song sung at the birth of a person.
BIRTH'-STRANGLED, a. [birth and strangle.] Strangled or suffocated in being born.