dredge vs trephine

dredge

verb
  • To bring something to the surface with a dredge. 

  • To make a channel deeper or wider using a dredge. 

  • To sprinkle (food) with spices or seasonings, using a dredge. 

  • To unearth. 

noun
  • A mixture of oats and barley. 

  • Very fine mineral matter held in suspension in water. 

  • A large shaker for sprinkling spices or seasonings during food preparation. 

  • A dragnet for taking up oysters, etc., from their beds. 

  • An iron frame, with a fine net attached, used in collecting animals living at the bottom of the sea. 

  • The act of dredging. 

  • A dredging machine. 

trephine

verb
  • To perforate with a trephine. 

  • To use a trephine during surgery. 

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

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