elliptical vs ooidal

elliptical

adj
  • Elliptic. 

  • Concise, condensed. 

  • In a shape of, or reminding of, an ellipse; oval. 

  • Of, or showing ellipsis; having a word or words omitted. 

noun
  • An elliptical trainer. 

  • An elliptical galaxy. 

ooidal

adj
  • Oolitic. 

  • Egg-shaped. 

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