Crossword Genius

Lens that is convex on one side and concave on the other (8)

Ross

I believe the answer is:

meniscus

(Other definitions for meniscus that I've seen before include "Curve on fluid surface in a tube" , "Curve on liquid surface" , "Cartilage between bones that meet at a joint" , "Curved upper surface of liquid in a tube" , "Overfilled glass shows it!" .)

I've seen this clue in The Mirror.
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