The Collaborative International Dictionary of English v.0.48:

Ovate \O"vate\, a. [L. ovatus, from ovum egg. See Oval.]
   [1913 Webster]
   1. Shaped like an egg, with the lower extremity broadest.
      [1913 Webster]

   2. (Bot.) Having the shape of an egg, or of the longitudinal
      section of an egg, with the broader end basal. --Gray.
      [1913 Webster]

WordNet (r) 3.0 (2006):

ovate
    adj 1: of a leaf shape; egg-shaped with the broader end at the
           base
    2: rounded like an egg [syn: egg-shaped, elliptic,
       elliptical, oval, oval-shaped, ovate, oviform,
       ovoid, prolate]