A slight convex curve of a surface, such as in a prestressed concrete deck.
Merriam-Webster Online Dictionarycamber
to curve upward in the middle
to arch slightly
to impart camber to
a slight convexity, arching, or curvature (as of a beam, deck, or road)
the convexity of the curve of an airfoil from the leading edge to the trailing edge
a setting of the wheels of an automotive vehicle closer together at the bottom than at the top