the termination of a pregnancy after, accompanied by, resulting in, or closely followed by the death of the embryo or fetus: such as spontaneous expulsion of a human fetus during the first 12 weeks of gestation - induced expulsion of a human fetus - expulsion of a fetus by a domestic animal often due to infection at any time before completion of pregnancy. a misshapen thing or person: MONSTROSITY. something regarded as horrifically or disgustingly bad. arrest of development (as of a part or process) resulting in imperfection.