Collins Concise English Dictionary © HarperCollins Publishers::

haematocrit, US hematocrit /ˈhɛmətəʊkrɪt ˈhiː-/ n
  1. a centrifuge for separating blood cells from plasma
  2. Also called: packed cell volume the ratio of the volume occupied by these cells, esp the red cells, to the total volume of blood, expressed as a percentage
Etymology: 20th Century: from haemato- + Greek kritēs judge, from krinein to separate



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