curd vs medulla

curd

noun
  • The edible flower head of certain brassicaceous plants. 

  • The coagulated part of any liquid. 

  • The part of milk that coagulates when it sours or is treated with enzymes; used to make cottage cheese, dahi, etc. 

verb
  • To form curd; to curdle. 

  • To cause to coagulate or thicken; to cause to congeal; to curdle. 

medulla

noun
  • The internal tissue of a plant. 

  • The medulla oblongata. 

  • The soft inner part of something, especially the pith of a fruit. 

  • The inner substance of various organs and structures, especially the marrow of bones. 

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