Synonyms for Oval (same or very similar meaning)
WordNet sense 1 (a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it):
ellipseWordNet sense 2 (rounded like an egg):
elliptic, elliptical, ovate, ovoid, egg-shaped, oviform, prolate, oval-shapedWordNet sense 3 (curving and somewhat round in shape rather than jagged):
roundedFrom the ODE community, based on WordNetadd/edit