Having the shape or form of a keel; resembling a ship's keel in structure.
From Latin 'carina' (keel) combined with '-form' meaning shaped like, creating an adjective that describes anything keel-shaped.
A cariniform structure in nature is basically nature's way of creating strength through streamlining—that keel shape concentrates material in the middle where it's most needed, which is why you see it in everything from seeds to seashells.
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