concave
61concave — con·cave …
62concave — [kɒnˈkeɪv] , [ˈkɒnkeɪv] adj curved inwards Ant: convex …
63convexo-concave — concave on one side and convex on the other …
64concave slope — a slope which becomes progressively shallower downhill. It can refer to an entire slope or part of one. On a map the Contour lines will be spaced further apart with a decline in height above sea level …
65concave lens — a lens that has a surface curved like part of the interior of a hollow sphere, so that it diverges rays of light. Called also diverging l. and minus l …
66concave lens double — biconcave l …
67concave lens periscopic — convexoconcave l …
68concave lens — lens which is rounded inward …
69concave mirror — mirror rounded inward …
70concave weld face — A weld having the center of its face below the weld edges …