discoid vs flan

discoid

adj
  • Shaped like a disc/disk. 

noun
  • A disk-shaped dental excavator designed to remove the carious dentin of a decayed tooth 

flan

verb
  • To splay or bevel internally, as a window-pane. 

noun
  • A coin die. (Compare planchet.) 

  • A fan of the U.S. TV series Firefly. 

  • Baked tart with sweet or savoury filling in an open-topped pastry case. (Compare quiche.) 

  • A dessert of congealed custard, often topped with caramel, especially popular in Spanish-speaking countries. 

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