Pronunciation: (ath'ōs, ā'thos; Gk. ä'thôs),[key] —n.Mount, 1. the easternmost of three prongs of the peninsula of Chalcidice, in NE Greece: site of an autonomous theocracy constituted of 20 monasteries. 1713; 131 sq. mi. (340 sq. km); ab. 35 mi. (56 km) long.
2. a headland on this peninsula. 6350 ft. (1935 m) long.