From Latin aphaeresis, from Ancient Greek ἀφαίρεσις (aphaíresis, “a taking away”), from ἀφαιρέειν (aphairéein) (from ἀφ- (aph-) (aph-, “aph-”, variant of ἀπό (apó, “off”, “away from”) before an aspirated vowel) + αἱρέειν (hairéein, “to take”, “to snatch”)) + -σις (-sis) (-sis, suffix forming nouns of action); the grammatical sense developed in Latin.
apheresis (plural aphereses) (US, Canada)
- (linguistics, prosody) Elision, suppression, or complete loss of a letter or sound (syllable) from the beginning of a word, such as the development of special from especial; procope.
- (medicine, specific, still current) The removal of blood from a patient, and the removal of certain components (such as platelets) from that blood, followed by the transfusion of the filtered blood back to the donor (patient).
- (medicine, general, obsolete) Extirpation or extraction of a superfluity (especially a pathological one) from the body, especially blood.
- (linguistics, prosody): aphesis
- “aphæresis” listed in the Oxford English Dictionary [2nd Ed.; 1989]