You searched for: “aspherical
aspherical (adjective), more aspherical, most aspherical
With reference to a reflecting surface or lens, deviating slightly from a perfectly round shape and relatively free from aberrations: "In photography, a lens assembly that includes an aspheric element is often called an aspherical lens."

"As a joke, Lance described his cat as aspherical; that is, not quite round but very plump."

This entry is located in the following units: -ical (page 4) sphero-, spher-, -sphere- (page 1)