also birthmark, "congenital mark or blemish," by 1805, from birth (n.) + mark (n.1). Birth marks in 17c. could be longing marks; supposedly they showed the image of something longed for by the mother while expecting. Related: Birthmarked.
Biro
birth
birthday
birthday suit
birthing
birth-mark
birthplace
birth-rate
birthright
birthstone
bis-
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