The Collaborative International Dictionary of English v.0.48:

Convexo-concave \Con*vex"o-con"cave\ (?or ?), a.
   Convex on one side, and concave on the other. The curves of
   the convex and concave sides may be alike or may be
   different. See Meniscus.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

bulging \bulging\ adj.
   1. curving or bulging outward. Opposite of concave.
      [Narrower terms: biconvex, convexo-convex, lenticular,
      lentiform; broken-backed, hogged; convexo-concave;
      gibbous, gibbose; planoconvex] Also See: protrusive.

   Syn: convex.
        [WordNet 1.5]

   2. curving outward.

   Syn: bellied, bellying, bulbous, bulgy, protuberant.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

convexo-concave
    adj 1: convex on one side and concave on the other with the
           convexity being greater than the concavity