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A longitudinal ridge or projection like the keel of a boat. / (botany) Part of a papilionaceous flower consisting of two petals, commonly united, which encloses the organs of fructification.

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carina

The fossilized shell displayed a prominent carina that ran along its length, giving it a sharp, keel-like profile.

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The fossilized shell displayed a prominent carina that ran along its length, giving it a sharp, keel-like profile.

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