1: Someone who believes that abortion is wrong to the extent that they wish to ban abortions for everyone, thus forcing women who have been raped, had birth control fail, have a life-threatening pregnancy, or have a terminally defective fetus to carry their feti to term. Also known by the alternate term 'anti-choice' and the more innocent-sounding 'pro-life'.
2: Someone who believes that the rights of an undifferentiated blob of cells that is nowhere near recognizable as human (or anything else, for that matter) has rights that far surpass, in both importance and magnitude, those of the fully formed, living, breathing, thinking individual whom the cells have parasitized.
Note: some forced-birthers even go so far as to bomb abortion clinics in an attempt to kill abortion-performing doctors. Ironically, they do this because they feel that life is so damned sacred. (See also: hypocrite)
Forced-birthers would set a far better example if they stopped screeching at all the pro-choicers and adopted some of the unwanted children who wound up in orphanages because they changed the minds of the women who got pregnant with them.
Someone who is so strongly against abortion (especially those who have exception clauses in cases of rape, incest, and maternal/fetal death) that would rather force a pregnant woman to carry that child to term whether she wants to or not, then allow her the freedom of choice.
An aquaintance of mine says that if a girl is stupid enough to get pregnant, then she should take responsibility and forced to have the child.