The Collaborative International Dictionary of English v.0.48:

egg-shaped \egg"-shaped`\, a.
   Resembling an egg in form; ovoid.

   Syn: elliptic, elliptical, oval, ovate, oviform, ovoid,
        prolate.
        [1913 Webster + WordNet 1.5]

WordNet (r) 3.0 (2006):

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