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.

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

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

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

• curved or bowed outward like the outside of a bowl
  
• arched, curved, or rounded outward like the exterior of a sphere or circle or the front surface of a spectacle or contact lens cornea the transparent, anterior, dome-shaped portion of the eyeball that covers the iris and pupil, acting like a window which admits light into the eye