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blood relation a person to whom one is related by birth; blood relative.
bloodroot a North American spring wildflower that bears a single white flower and has a fleshy red root that yields a toxic red sap.
bloodshed the spilling of blood through injury or violence, esp. the destruction of living beings; warfare.
bloodshot (of eyes) showing dilated blood vessels; red and irritated.
bloodstain a discoloration or mark left by blood.
bloodstained stained with blood. [2 definitions]
bloodstone a semiprecious green or greenish quartz flecked with red jasper; heliotrope.
bloodstream the blood flowing within the circulatory system of a living organism.
bloodsucker an animal that sucks blood from others, esp. a leech; parasite. [2 definitions]
blood sugar glucose in the blood or the concentration of glucose in the blood.
blood test any test of the blood, as to determine type, red or white blood count, or the presence of antibodies or bacteria.
blood thinner a drug that inhibits blood clotting.
blood-thinning of or pertaining to a drug that inhibits blood clotting.
bloodthirsty eager to cause or attracted to acts of bloodshed; cruel.
blood type see blood group.
blood typing the classification of blood samples according to blood group, esp. to determine compatibility of donors with recipients of transfusions or transplants.
blood vessel any of the arteries, veins, or capillaries through which the blood circulates.
bloody covered with or exuding blood. [4 definitions]
bloody Mary (often cap.) a mixed drink made mostly of vodka and tomato juice.
bloody-minded tending to be cruel, violent, or disruptive.
bloom a flower; blossom. [8 definitions]