The Collaborative International Dictionary of English v.0.48:

Plano-convex \Pla"no-con"vex\, a. [Plano- + convex.]
   Plane or flat on one side, and convex on the other; as, a
   plano-convex lens. See Convex, and Lens.
   [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):

planoconvex
    adj 1: flat on one side and convex on the other