define concave and convex
convex. adj. 1. curving or bulging outwards. 2. (General Physics) physics having one or two surfaces curved or ground in the shape of a section of the exterior of a sphere, paraboloid, ellipsoid, etc: a convex lens. 3. (Mathematics) maths (of a polygon) containing no interior angle greater than 180Â°.
concave. rounded and somewhat depressed or hollowed out. concave face. of the Golgi complex in the developing embryo is associated with maturing secretory vesicles. concave shoe. a horseshoe with its inner edge thicker than the outer so that the surface touching the ground is slightly smaller than the surface in contact with the hoof.