the act of giving premature birth; particularly, the expulsion of the human fetus prematurely, or before it is capable of sustaining life; miscarriage.-the immature product of an untimely birth.-arrest of development of any organ, so that it remains an imperfect formation or is absorbed.-any fruit or produce that does not come to maturity, or anything which in its progress, before it is matured or perfect; a complete failure; as, his attempt proved an abortion.