milt vs spermatozoan

milt

noun
  • The semen of a male fish. 

  • The spleen, especially of an animal bred for food. 

verb
  • To impregnate (the roe of a fish) with milt. 

spermatozoan

noun
  • A spermatozoon. 

adj
  • Of or pertaining to spermatozoa. 

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