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blood bank a place where blood is collected, processed, and stored as whole blood or plasma, for later use in transfusion.
bloodbath a brutal and indiscriminate slaughter of many people or a whole population; massacre. [2 definitions]
blood blister a blister that contains blood and sometimes also serum. (Cf. water blister.)
blood-borne carried or transmitted by blood.
blood brother one's brother by birth. [2 definitions]
blood-clotting of or relating to a substance or condition that affects the clotting of blood.
blood count the number of red cells, white cells, and platelets counted in a specific volume of blood. [2 definitions]
bloodcurdling causing extreme fright; horrifying.
blooded having blood of a certain kind (usu. prec. by a modifier). [2 definitions]
blood feud an ongoing, bitter conflict or fight between families.
blood glucose glucose in the blood or the concentration of glucose in the blood; blood sugar.
blood group any of several types in which human blood can be classed, each with its own inherited immunological and agglutinative characteristics; blood type.
bloodhound a large hound with a particularly keen sense of smell, long ears, and baggy skin, used chiefly for tracking humans or animals.
bloodless without, or as without, blood or enough blood; pale. [3 definitions]
bloodletting the act or practice of purging by opening a vein; phlebotomy. [2 definitions]
bloodline ancestry, esp. of animals; pedigree.
bloodlust a strong desire for the use of violence towards others.
bloodmobile a mobile unit carrying medical equipment for collecting blood from donors for a blood bank.
blood money a fee paid to a hired assassin. [3 definitions]
blood poisoning the presence and persistence in the blood of impurities or toxins; septicemia; toxemia.
blood pressure the pressure of the blood against the inner wall of blood vessels, esp. the arteries or the heart, as exerted by the contractions of the heart muscles, often measured as an indicator of physical health.