oval vs quadratic

oval

adj
  • Having the shape of an oval. 

  • Of or pertaining to an ovum. 

noun
  • A thing having such a shape, such as an arena. 

  • In a projective plane, a set of points such that no three are collinear and there is a unique tangent line at each point. 

  • An elongated round shape resembling an egg or ellipse. 

  • A sports field, typically but not exclusively oval in shape. 

quadratic

adj
  • square-shaped 

  • of a function, of the form y=ax²+bx+c. 

  • of a polynomial, involving the second power (square) of a variable but no higher powers, as ax²+bx+c. 

  • of an equation, of the form ax²+bx+c=0. 

noun
  • A quadratic polynomial, function or equation. 

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