con•vexkɒnˈvɛks, kən-; ˈkɒn vɛks(adj.; n.)

1. curved or rounded outward like the outside of a circle or sphere.

   Ref: Compare concave (def. 1). 1

2. (of a polygon) having all interior angles less than or equal to 180°.

   Category: Math

3. (n.)a convex surface, part, line, or thing.

Origin of convex:

1565–75; < L convexus=con-con - +-vexus, perh. <*wek-sos, der. of base of vehere to carry, bring, if orig. sense was “brought together (to a point)”

con•vex′ness(n.)