Having been made convex; shaped so that the surface curves outward like the outside of a sphere.
Convex (Latin convexus: arched, vaulted) + -ed (past participle or adjectival suffix). A rare formation treating 'convex' as a verb ('to convex' = to make convex).
While you can say 'convex' as an adjective directly, 'convexed' isn't common because English prefers to let adjectives stand alone rather than add -ed unnecessarily. It's grammatically possible but stylistically awkward.
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