apheresis vs syncope

apheresis

noun
  • 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. 

  • 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). 

syncope

noun
  • The loss or elision of a sound, from the interior of a word, especially of a vowel sound with loss of a syllable. 

  • A loss of consciousness when someone faints. 

  • A missed beat or off-beat stress in music resulting in syncopation. 

How often have the words apheresis and syncope occurred in a corpus of books? (source: Google Ngram Viewer )