Convex

Part of speech: noun (n.)

A convex body or surface. Half heaven's convex glitters with the flame. Tickell.

Part of speech: adjective (a.)

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.