A small keel-like ridge or projection, a diminutive form of carina.
From Latin 'carina' (keel) plus the diminutive suffix '-ula', creating a term for a small or delicate keel-like structure found in botanical and biological descriptions.
Botanists use 'carinula' when they're describing tiny ridge-like features on seeds or flower parts that are too small to call a full 'carina'—it's the specialized vocabulary that lets scientists describe nature's smallest architectural details.
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