The Collaborative International Dictionary of English v.0.48:

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.

   Syn: oviform.
        [1913 Webster]