convexoconcave lens (medicine) and twitchy(1) (iou)

convexoconcave lens (medicine)

convexoconcave lens

A minus power lens having one surface convex and the opposite surface concave, with the latter having the greater curvature.

twitchy(1) (iou)

twitchy adjective1. rare. M17.
[from TWITCH noun2 + -Y1.]
Full of or infested with twitch or couch grass; made of twitch.

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