A small heel-like structure or a diminutive spur found in certain organisms.
From Spanish/Italian diminutive form derived from Latin 'calcavus' or related to 'calx' (heel), with the '-ella' suffix creating a smaller version of the structure.
This delightfully specific term shows how different languages evolved tiny words for tiny biological features—it's like calling something a 'little-heel-ling' in Romantic languages.
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