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chill factor see windchill factor.
extrinsic factor a vitamin found in foods such as milk, eggs, and fish, used in the treatment of anemia; vitamin B12.
intrinsic factor a substance secreted by the stomach that promotes the body's ability to absorb vitamin B12.
load factor the amount or weight of the maximum load a vehicle, airplane, or vessel can carry. [2 definitions]
Rh factor a substance usu. present in the red blood cells that may cause severe negative reaction if transferred, as by pregnancy or blood transfusions, into a person lacking this substance.
windchill factor the temperature felt by the body that represents a combination of the temperature of the air and the velocity of the wind.