callus vs dredge

callus

noun
  • The new formation over the end of a cutting, before it puts out rootlets. 

  • A shining area on the frons of many species of Tabanomorpha (horse flies and relatives). 

  • The material of repair in fractures of bone; a substance exuded at the site of fracture, which is at first soft or cartilaginous in consistency, but is ultimately converted into true bone and unites the fragments into a single piece. 

  • A hardened area of the skin (especially on the foot or hand) caused by repeated friction, wear or use. 

verb
  • To form such hardened tissue. 

dredge

noun
  • The act of dredging. 

  • 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. 

  • A dredging machine. 

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

  • To bring something to the surface with a dredge. 

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

  • To unearth. 

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