a. Convex on one side, and concave on the other. The curves of the convex and concave sides may be alike or may be different. See Meniscus. [ 1913 Webster ]
a. Convex on both sides; double convex. See under Convex, a. [ 1913 Webster ]
a. Convex on one side, and flat on the other; plano-convex. [ 1913 Webster ]