hematocrit
n 1: the ratio of the volume occupied by packed red blood cells
to the volume of the whole blood as measured by a
hematocrit [syn: {hematocrit}, {haematocrit}, {packed cell
volume}]
2: a measuring instrument to determine (usually by
centrifugation) the relative amounts of corpuscles and plasma
in the blood [syn: {hematocrit}, {haematocrit}]