The Collaborative International Dictionary of English v.0.48:

Spheroidal \Sphe*roid"al\, a. [Cf. F. sph['e]ro["i]dal.]
   Having the form of a spheroid. -- Sphe*roid"al*ly, adv.
   [1913 Webster]

   Spheroidal state (Physics.), the state of a liquid, as
      water, when, on being thrown on a surface of highly heated
      metal, it rolls about in spheroidal drops or masses, at a
      temperature several degrees below ebullition, and without
      actual contact with the heated surface, -- a phenomenon
      due to the repulsive force of heat, the intervention of a
      cushion of nonconducting vapor, and the cooling effect of
      evaporation.
      [1913 Webster] Spheroidic

WordNet (r) 3.0 (2006):

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