Having two sharp ridges or keel-like structures, often used to describe biological features like leaves or seeds.
From bi- (two) + carinate (having a keel or ridge, from Latin carina meaning keel). Evolved in botanical and zoological terminology in the 18th century.
Many plant seeds have these two sharp ridges that help them tumble and spread in the wind—nature's way of building aerodynamics into a tiny package!
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