apheresis vs clipping

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). 

clipping

noun
  • A short form (of a word) created by removing syllables. 

  • The use of a mask to hide part of an object or image. 

  • The process of cutting off a signal level that rises above a certain maximum level. 

  • Falling, rolling, or throwing one's body on the back of an opponent's legs after approaching from behind. 

  • A piece of something removed by clipping. 

  • An article clipped from a newspaper. 

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