snare vs trephine

snare

noun
  • A similar looped instrument formerly used to remove tumours etc. 

  • A trap (especially one made from a loop of wire, string, or leather). 

  • A set of stiff wires held under tension against the lower skin of a drum to create a rattling sound. 

  • A mental or psychological trap. 

  • A snare drum. 

  • A loop of cord used in obstetric cases, to hold or to pull a fetus from the mother animal. 

verb
  • To catch or hold, especially with a loop. 

  • To ensnare. 

trephine

noun
  • A surgical instrument with a cylindrical blade used to remove a circular section of tissue, f.e. bone or cornea; a trepan. 

verb
  • To use a trephine during surgery. 

  • To perforate with a trephine. 

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