noun
1. : the determination of the blood cells in a definite volume of blood by partial enumeration and extrapolation — compare red count , white count ; differential blood count
2. : the number of blood cells in a definite volume of the blood of an individual as determined by a blood count, a figure that varies with sex, physiologic state, and health but in normal man approximates 5,000,000 red cells and 7000 white cells per cubic millimeter, the latter divided among 55 percent or more neutrophils, about 30 percent lymphocytes, and small percentages of eosinophils, monocytes, and basophils