Definition of apheresis in English:


(also aphaeresis)


mass noun
  • 1Linguistics
    Omission of the initial sound of a word, as when he is is pronounced he's.

    • ‘When the indefinite article was being restored to its separate existence, the word ‘atomy’ was falsely coined from ‘anatomy’ through aphaeresis, by the removal of the supposed indefinite article.’
    • ‘In some words initial e has been lost by aphaeresis: squire from esquire, sample from example, state from estate.’
    leaving out, exclusion, exception, non-inclusion, deletion, erasure, cut, excision, elimination, absence
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  • 2Medicine
    A technique by which a particular substance or component is removed from the blood, the main volume being returned to the body.

    • ‘Now, Becky donates just platelets and plasma via a process called apheresis.’
    • ‘Platelets collected by apheresis were counted as single units.’
    • ‘Removing blood stem cells from your blood during apheresis doesn't hurt.’
    • ‘Another method used for separating out some of the components of blood consists of a technique known as apheresis.’
    • ‘Since most of the patients are not eligible for allogenic transplantation, autologous bone marrow or more increasingly mobilized peripheric blood stem cells obtained by apheresis are used for grafting.’


Mid 16th century: via late Latin from Greek aphairesis, from aphairein ‘take away’, from apo ‘from’ + hairein ‘take’.