Source : Webster's Revised Unabridged Dictionary (1913)

Convex \Con"vex\, a. [L. convexus vaulted, arched, convex,
   concave, fr. convehere to bring together: cf. F. convexe. See
   {Vehicle}.]
   Rising or swelling into a spherical or rounded form;
   regularly protuberant or bulging; -- said of a spherical
   surface or curved line when viewed from without, in
   opposition to concave.

         Drops of water naturally form themselves into figures
         with a convex surface.                   --Whewell.

   {Double convex}, convex on both sides; convexo-convex.

Convex \Con"vex\, n.
   A convex body or surface.

         Half heaven's convex glitters with the flame.
                                                  --Tickell.

   Note: This word was often pronounced con-vex' by early
         writers, as by Milton, and occasionally by later poets.

Source : WordNet®

convex
     adj : curving or bulging outward [syn: {bulging}] [ant: {concave}]