noun
a convex shape or surface
adjective
having a surface or boundary that curves or bulges outward, as opposed to concave
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The convex shape of the lens focuses light onto the retina.
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The mirror is kind of convex, so it makes things look bigger.
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That convex curve is really cool, it gives the room a modern vibe.
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Her smile created a convex curve on her face, showing her happiness.