The Collaborative International Dictionary of English v.0.48:

Ellipsoid \El*lip"soid\, Ellipsoidal \El`lip*soi"dal\, a.
   Pertaining to, or shaped like, an ellipsoid; as, ellipsoid or
   ellipsoidal form. Elliptic

WordNet (r) 3.0 (2006):

ellipsoidal
    adj 1: having the nature or shape of an ellipsoid [syn:
           ellipsoid, ellipsoidal, spheroidal]

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "ellipsoidal":
   bell-like, bell-shaped, bulblike, bulbous, campaniform, campanular,
   campanulate, ellipsoid, elliptic, global, globate, globe-shaped,
   globed, globelike, globoid, globose, globular, hemispheric,
   obovoid, orb, orbed, orbic, orbicular, orbiculate, orblike, orby,
   ovoid, parabolic, saucer-shaped, sphere-shaped, spherelike,
   spheric, spheriform, spheroid