Source : Webster's Revised Unabridged Dictionary (1913)

Ovoid \O"void\, Ovoidal \O*void"al\, a. [Ovum + -oid: cf. F.
   ovo["i]de.]
   Resembling an egg in shape; egg-shaped; ovate; as, an ovoidal
   apple.

Ovoid \O"void\, n.
   A solid resembling an egg in shape.

Source : WordNet®

ovoid
     adj : rounded like an egg [syn: {egg-shaped}, {elliptic}, {elliptical},
            {oval}, {ovate}, {oviform}, {prolate}]
     n : an egg-shaped object