椭圆

oval / ellipse / elliptic

ellipse

circle / round / circular / spherical / (of the moon) full / unit of Chinese currency (yuan) / tactful / to make consistent and whole (the narrative of a dream or a lie)

oval

Oval office (in the White House)

(math.) elliptic integral

elliptical machine (exercise)

(math.) elliptic function

(math.) elliptic curve