名詞 oval:

1. a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it
   同義詞：ellipse

形容詞 oval:

1. rounded like an egg
   同義詞：egg-shaped, elliptic, elliptical, oval-shaped, ovate, oviform, ovoid, prolate

1. Comets move around the sun like planets, but in long oval course.
   彗星象行星一樣繞太陽運轉(zhuǎn)，然而其軌道呈狹長的橢圓形。
2. A pitcher, especially a decorative one with a base, an oval body, and a flaring spout.
   大口水罐一個具有裝飾性的水罐，有一個底，橢圓形的罐體和一個突出來的壺嘴
3. The mirror is oval.
   鏡子是橢圓的。
4. The playing field is a large oval.
   球場很大，呈橢圓形。

o.val

adj.（形容詞）
Resembling an egg in shape.
卵形的：形狀象雞蛋的
Resembling an ellipse in shape; elliptical.
橢圓形的：形狀類似橢圓的，橢圓的
n.（名詞）
An egg-shaped or elliptical form or figure.
卵形，橢圓形：卵形或橢圓形的形狀或圖形
An elliptical track, as for racing or athletic events.
橢圓形跑道：如用于比賽或運動項目的橢圓形跑道

來源：
Medieval Latin ôv3lis
中世紀(jì)拉丁語 ôv3lis
from Latin ôvum [egg] * see awi-
源自 拉丁語 ôvum [卵，蛋] *參見 awi-

【引伸】
o.vally
adv.（副詞）
o.valness
n.（名詞）