curtilage vs quadrangle

curtilage

noun
  • The area immediately surrounding a house, especially dooryard areas and sometimes including closely associated buildings and structures. 

quadrangle

noun
  • The buildings forming the border of such a courtyard. 

  • A geometric shape with four angles and four straight sides; a four-sided polygon. 

  • A courtyard which is quadrangular. 

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