WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the ratio of the volume occupied by packed red blood cells to the volume of the whole blood as measured by a hematocrit
n. a measuring instrument to determine (usually by centrifugation) the relative amounts of corpuscles and plasma in the blood
Word Usage
"HES is known to improve the blood circulation, but it also helps to maskthe use of blood boosting substances such as EPO erythropoietin by reducingthe levels of red blood cells, known as haematocrit."