cowling vs reticulum

cowling

noun
  • A young or little cow; calf. 

  • A removable protective covering for the engine of an aircraft, motorcycle, etc. 

reticulum

noun
  • The second compartment of the stomach of a cow or other ruminant. 

  • A pattern of interconnected objects. 

  • A network. For example, the endoplasmic reticulum forms a network of cellular components that functions as a transportation system within the cell. 

  • The tripe made from the second compartment of the stomach of a cow (or other ruminant). 

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