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]

The Collaborative International Dictionary of English v.0.48:

Bulge \Bulge\, v. i. [imp. & p. p. Bulged; p. pr. & vb. n.
   Bulging.]
   1. To swell or jut out; to bend outward, as a wall when it
      yields to pressure; to be protuberant; as, the wall
      bulges.
      [1913 Webster]

   2. To bilge, as a ship; to founder.
      [1913 Webster]

            And scattered navies bulge on distant shores.
                                                  --Broome.
      [1913 Webster]

WordNet (r) 3.0 (2006):

bulging
    adj 1: curving or bulging outward [syn: convex, bulging]
           [ant: concave]
    2: curving outward [syn: bellied, bellying, bulbous,
       bulging, bulgy, protuberant]