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Llullaillaco(yo͞o'yīyä`kō), extinct volcano, 22,057 ft (6,723 m) high, on the border of Chile and Argentina. One of the highest peaks in the Andes and perpetually snowcapped, it overlooks a pass used for rail and highway traffic between Chile and Argentina.
a volcano in South America, in the south central Andes, on the border between Chile and Argentina. Elevation, 6,723 m. The volcano is snow-covered. It emitted smoke in 1854.