Something that's shaped like an egg is an ovoid. If you want to impress your friends, call that sculpture in the park that looks like an oval an ovoid.
Ovoid can also be used as an adjective that means "egg-shaped," as in the ovoid chocolates in a box of candy. Ovoid comes from the Latin word ovum, meaning "egg." The suffix -oid means "like." When you combine those, you can easily see how ovoid came to mean "egg-like." To correctly pronounce ovoid, accent the first syllable and give it the long o sound: "OH-void."