- hematocrit, haematocrit, packed cell volume - the ratio of the volume occupied by packed red blood cells to the volume of the whole blood as measured by a hematocrit
--1 is a kind of ratio
- hematocrit, haematocrit - a measuring instrument to determine (usually by centrifugation) the relative amounts of corpuscles and plasma in the blood
--2 is a kind of measuring instrument, measuring system, measuring device; centrifuge, extractor, separator