apheresis

/əˈfɛrəsɪs/
noun
  1. The loss of one or more sounds or syllables from the beginning of a word, especially in the historical development of a language or in casual speech.
    • Linguists study apheresis to understand how words change over time.
    • The word 'round' comes from 'around' through apheresis of the initial vowel.
    • In casual English, apheresis turns 'because' into 'cause'.
  2. A medical procedure in which blood is taken from a person, a specific component (such as plasma or platelets) is removed, and the rest is returned to the body.
    • The patient underwent apheresis to remove excess antibodies from her blood.
    • Doctors used apheresis to treat the rare autoimmune disorder.
    • Donating platelets through apheresis takes longer than a regular blood donation.
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