The Collaborative International Dictionary of English v.0.48:

Apocarpous \Ap`o*car"pous\, a. [Pref. apo- + Gr. karpo`s fruit.]
   (Bot.)
   Either entirely or partially separate, as the carpels of a
   compound pistil; -- opposed to syncarpous. --Lindley.
   [1913 Webster]

WordNet (r) 3.0 (2006):

apocarpous
    adj 1: (of ovaries of flowering plants) consisting of carpels
           that are free from one another as in buttercups or roses
           [ant: syncarpous]