Having ribs or rib-like ridges on a surface, as seen on shells, leaves, or anatomical structures.
From Latin costatus (ribbed), used in scientific and anatomical English since the 18th century to describe organisms or objects with prominent ridge or rib patterns.
Naturalists use 'costate' to describe everything from seashells to pinecones—it's one of those precise scientific adjectives that lets you describe a texture without needing a detailed explanation.
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