1 curving or bulging outwards
2 (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 (Maths) (of a polygon) containing no interior angle greater than 180°
4 tr to make convex
concave (C16: from Latin convexus vaulted, rounded)
1 having one side concave and the other side convex
2 (of a lens) having a concave face with greater curvature than the convex face
adj (esp. of a lens) having both sides convex; biconvex
adj (of a lens) having one side convex and the other side plane
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