An Etymological Dictionary of Astronomy and Astrophysics

Having the general form, shape, or outline of an egg; ellipsoidal or elliptical.

Etymology (EN): From M.L. ovalis “egg-shaped,” from L. ovum “egg,” cognate with Pers. xâg, as below.

Etymology (PE): Xâgi “egg-shaped,” literally “pertaining to an egg,” from xâg “egg,” Lori, Laki xâ, Pash. hâ “egg,” Ossetic ajk “egg,”
Khotanese āhaa- “egg;” variant xâyé “egg; testicle;” Mid.Pers. xâyak “egg;” Av. aēm/aiam “egg;” cf.
Gk. oion, L. ovum, as above; Goth. ada; O.E. æg;
Ger. Ei; PIE *owyo-/*oyyo- “egg.”