Curved inward on both sides; having a symmetrical concave shape when viewed from different angles.
From Greek 'amphi-' (both) + 'kyrtos' (curved). A biological term often used to describe the shape of organism parts.
Many marine shells are amphicyrtous—curved inward on both surfaces—because this shape distributes pressure evenly, letting creatures build thinner, lighter shells without sacrificing strength, a perfect example of nature's engineering efficiency.
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