A wall constructed of gray stone or brick; a gray-colored wall or barrier.
Compound of 'gray' and 'wall' (from Old English 'weall', from Latin 'vallum'). A descriptive term for walls built from gray materials or having gray appearance.
The color of old stone walls tells the story of geology—gray granite walls mean granite bedrock nearby, while yellow limestone walls show you're in limestone country. Walls are geological maps!
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