con·vexo-con·cave /kənˌvɛk(ˌ)sokɑnˈkev, kɑnˌvɛk, ˈkɑnˌkev/
  (a.)半凸半凹面的
  con·vexo-concave /kənˌvɛk(ˌ)so, kɑn-/ 形容詞
  凸凹的
  Con·vex·o-con·cave 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.
  ◄ ►
  convexo-concave
       adj : convex on one side and concave on the other with the
             convexity being greater than the concavity