concave
adjective(con-cave)
hollowed or rounded inward like the inside of a bowl
concave
adjective(con-cave)
arched in : curving in —used of the side of a curve or surface on which neighboring normals to the curve or surface converge and on which lies the chord joining two neighboring points of the curve or surface
concave
noun(con-cave)
a concave line or surface
concave
adjective(con-cave)
concavo-convex
concave
adjective(con-cave)
having the convex side of greater curvature than the concave
concave
adjective(con-cave)
flat on one side and concave on the other