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a1 one of the four human blood types. (See ABO system.) [1/6 definitions]
AB1 one of the four human blood groups. (See ABO system.)
ABO system a classification system for the inherited antigens found on the surface of human red blood cells, which determine compatibility for blood transfusions.
acetylcholine a form of this compound used in medicine for its ability to decrease blood pressure and cause muscular movement in such organs as the alimentary canal. [1/2 definitions]
Addison's disease a disease caused by disturbance or failure of the adrenal glands, resulting in anemia, low blood pressure, weakness, and an abnormal brownish tinge to the skin.
aerate to supply (the blood) with oxygen by respiration. [1/3 definitions]
afferent bearing or leading toward a central organ or part, as nerves that conduct impulses to the spinal column or as veins that carry blood to the heart.
AIDS acronym of "acquired immune deficiency syndrome," a usu. fatal viral disease of the body's immune system, transferred through blood, sexual contact, contaminated hypodermic needles, or the like.
akin related by blood; kin. [1/2 definitions]
albumin any of a class of proteins soluble in water and coagulating in heat, found in egg white, blood, milk, and various plant and animal tissues.
anastomose to connect, either by natural branching growth or by surgery (parts of a blood vessel, nerve, or any branching system).
anastomosis an interconnection between branches or tributaries, as in a river or blood vessels. [1/2 definitions]
anemia a condition resulting from a deficiency of red blood cells or hemoglobin and characterized by weakness, pallor, and difficulty in breathing.
anemic pertaining to or suffering from anemia, a condition resulting from a deficiency of red blood cells or hemoglobin and characterized by weakness, pallor, and difficulty in breathing. [1/2 definitions]
angina pectoris severe recurrent pain in the chest caused by a sudden decrease in the amount of blood flowing to the heart muscle.
angiogenesis the formation of new blood vessels.
angiogram an x-ray image of blood vessels that is taken after injecting a substance that absorbs x-rays into the blood.
angiography a technique for imaging blood vessels.
angioma a tumor consisting mainly of blood vessels or lymph vessels.
angioplasty surgical repair of a blood vessel.
antibody a protein in blood that reacts to particular toxic substances by neutralizing or destroying them, and thus provides immunity against them.