planoconvex en · ADJ
Etymology
From plano- + convex.
Meanings
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(not-comparable, of a lens) Having one side plane and the other convex.
I place my Microscope, and then so place either a round Globe of Water, or a very deep clear plano convex Glass (whose convex side is turn'd towards the Window) that there is a great quantity of Rayes collected and thrown upon the Object […].
1665, Robert Hooke, Micrographia: