convex
/ˈkɑn.vɛks/ noun C2- Any convex body or surface.
- A playing card made convex for use in cheating.
- A small convex mirror used to cheat by observing other players' cards.
Plural convexes
From the library
Then with an expression of interest he laid down his cigarette, and carrying the cane to the window, he looked over it again with a convex lens.
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