The story
From hemato- (“blood”) + Ancient Greek κριτής (kritḗs, “judge, umpire”), literally “to separate blood”, coined by Swedish physiologist Magnus Blix in 1891.
Etymology from Wiktionary, CC BY-SA 4.0.
hematocrit
Today it means: The percentage (by volume) of packed red blood cells in a centrifuged sample of blood. Full definition →