ooidal vs rotund

ooidal

adj
  • Egg-shaped. 

  • Oolitic. 

rotund

adj
  • Having a round body shape; portly or plump; podgy. 

  • Full and rich; orotund; sonorous; full-toned. 

  • Having a round, spherical or curved shape; circular; orbicular. 

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