A ridge is a long, narrow raised area, like the top of a mountain range or a line along a roof. It can also describe any raised line on a surface.
From Old English *hrycg* “back, spine, ridge,” related to German *Rücken* “back.” The original image is the “back” or spine of a hill or roof.
A mountain ridge is like the backbone of the landscape—the same idea that gave us “ridge” from an old word for “back.” Even on your fingerprints, those tiny raised lines are called ridges, like a microscopic mountain range.
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