Of, or relating to glaciers.
We examined the glacial deposits.
Very slow.
He could remember a day that he had spent the whole of (he couldn't have been more than ten) running one of the great, creaking freight elevators at a glacial speed, answering the calls of the bell—one ring, five rings, three rings—with an almost unbearable sense of responsibility.
Cold and icy.
After the rain and frost, the pavements were glacial.
Of the Pleistocene period dominated by the presence of glaciers.
From French glacial, from Latin glaciālis, from glaciēs (“ice”). The sense "slow" refers to the speed of actual glaciers, typically around 1 meter per day.
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