apheresis vs elimination

apheresis

noun
  • 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). 

  • 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. 

elimination

noun
  • The act of obtaining by separation, or as the result of eliminating; deduction. 

  • The act of discharging or excreting waste products or foreign substances through the various emunctories. 

  • The act of voting off or throwing off a contestant in a reality television competition. 

  • The act of eliminating, expelling or throwing off. 

  • The act of causing a quantity to disappear from an equation; especially, in the operation of deducing from several equations containing several unknown quantities a less number of equations containing a less number of unknown quantities. 

  • The act of recording amounts in a consolidation statement to remove the effects of inter-company transactions. 

  • The act of excluding a losing contestant from a match, tournament, or other competition. 

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