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| transfer of information from one cell or molecule to another, as by chemical or electrical signals |
| a grouping of tissues into a distinct structure, as a heart or kidney in animals or a leaf or stamen in plants, that performs a specialized task |
abortion a·bor·tion (ə-bôr'shən)
n.
The expulsion of an embryo or fetus before it is viable.
A miscarriage.
An aborted organism.
Cessation of normal growth, especially of an organ or other body part, before full development or maturation.
The arrest of an action or process before its completion.
abortion (ə-bôr'shən) Pronunciation Key
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The deliberate termination of a pregnancy, usually before the embryo or fetus is capable of independent life. In medical contexts, this procedure is called an induced abortion and is distinguished from a spontaneous abortion (miscarriage) or stillbirth.
Note: Abortion laws are extremely controversial. Those who describe themselves as “pro-choice” believe that the decision to have an abortion should be left to the mother. In contrast, the “pro-life” faction, arguing that abortion is killing, holds that the state should prohibit abortion in most cases. Feminists (see feminism) and liberals generally support the pro-choice side; Roman Catholics and Protestant fundamentalists generally back the pro-life side. (See Roe versus Wade.)
The ending of pregnancy and expulsion of the embryo or fetus, generally before the embryo or fetus is capable of surviving on its own. Abortion may be brought on intentionally by artificial means (induced abortion) or may occur naturally (spontaneous abortion, which is commonly referred to as a miscarriage). (Compare stillbirth; see also family planning and population control.)