The Collaborative International Dictionary of English v.0.48:

Oviform \O"vi*form\ ([=o]"v[i^]*f[^o]rm), a. [Ovum + -form: cf.
   F. oviforme.] (Biol.)
   Having the form or figure of an egg; egg-shaped; as, an
   oviform leaf.

   Syn: ovoid, ovoidal.
        [1913 Webster]

WordNet (r) 3.0 (2006):

oviform
    adj 1: rounded like an egg [syn: egg-shaped, elliptic,
           elliptical, oval, oval-shaped, ovate, oviform,
           ovoid, prolate]