Relating to, resembling, or containing ice or glaciers; icy in nature or appearance.
From glacier/glacial plus -ous (Latin suffix meaning full of or having the nature of). This is a rare adjective form that treats glacier-related qualities as an inherent property.
Glacious landscapes are among Earth's most extreme environments—the Atacama Desert in Chile is so cold and dry that it's considered glacious even though it's technically a desert!
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