Of or relating to a condition in which there is an absence or deficiency of white blood cells in the blood, particularly in leukemia cases without elevated white cell counts.
A- (without) + leuco- (white) + -aemic (relating to blood condition, from Greek haima, 'blood'). British medical spelling variant of aleukemic.
Aleucaemic leukemia is medically fascinating: it's cancer of blood cells where the usual sign (high white blood cell count) is *missing*, making it a diagnostic trap that confused doctors until imaging technology improved.
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