In combination = Convexly, convex and —, as in Convexo-concave, convex on one side and concave on the other, and thickest in the center (cf. CONCAVO-CONVEX); of the form of a meniscus; Convexo-convex, convex on both sides; Convexo-plane, convex on one side, and flat on the other = plano-convex.
1693. E. Halley, in Phil. Trans., XVII. 961. Whether the Lens be … Plano-Convex or Plano-Concave, or Convexo-Concave.
1704. Newton, Optics (1704), 109. These are the Phænomena of thick convexo-concave plates of Glass, which are every where of the same thickness.
1816. J. Smith, Panorama Sci. & Art, I. 468. The use of a convexo-concave lens, instead of the double convex.
