A small rib-like anatomical structure or a ridge running lengthwise on a surface, particularly in botany and zoology.
From Latin 'costula', the diminutive form of 'costa' (rib), literally meaning 'little rib'. This scientific term is used across anatomy, botany, and zoology to describe fine rib-like patterns.
Nature uses ribbing everywhere—from the grooves on seed pods to ridges on insect exoskeletons—because it provides strength without adding weight. Scientists borrowed the word 'costula' to describe these tiny ridges when 'rib' wasn't specific enough.
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