An elliptical shape refers to a shape that is elongated and shaped like an oval or an egg. It is not a perfect circle, but rather a rounded and elongated form. Full definition
I had a couple of tyres a few years ago that made my whole car bounce slightly due to their sort of elliptical shape. (mechanics.stackexchange.com)
Displayed on this common ground, Constantin Brancusi's The First Cry (1917) dissolves the human form into elliptical shapes, and Alberto Giacometti's Femme Debout (1957) elongates a woman's body into abstraction. (whitechapelgallery.org)
Eccentricity: In a cycle of roughly 100,000 years, the shape of the Earth's orbit around the Sun varies from an almost perfect circle to a slightly more elliptical shape, with the Sun nearer one end (rather than in the middle), and then back to a more circular shape. (owlcation.com)