a city on Euboea, in SE Greece.
a Greek island in the W Aegean Sea. 1586 sq. mi. (4110 sq. km).
a city on the island of Euboea in SE Greece, at the narrowest point of the Euripus strait: important since the 7th century bc, founding many colonies in ancient times. Pop (municipality): 55 264 (2001) Modern Greek name Khalkís Medieval English name Negropont
an island in the W Aegean Sea: the largest island after Crete of the Greek archipelago; linked with the mainland by a bridge across the Euripus channel. Capital: Chalcis. Pop: 198 130 (2001). Area: 3908 sq km (1509 sq miles) Modern Greek name Évvoia Former English name Negropont
a learned borrowing from Greek meaning “copper,” used in the formation of compound words: chalcolithic. combining form indicating copper or a copper alloy: chalcopyrite, chalcolithic
a common mineral, cuprous sulfide, Cu 2 S: an important ore of copper. noun a lead-grey or black mineral, found as a copper ore or in veins. It is a source of copper. Composition: copper sulphide. Formula: Cu2S. Crystal structure: orthorhombic
Chemistry. any of the elements oxygen, sulfur, selenium, tellurium, and polonium, which form the VIa group in the periodic table. noun any of the elements oxygen, sulphur, selenium, tellurium, or polonium, of group 6A of the periodic table
Chemistry. a binary compound consisting of a chalcogen and a more electropositive element or radical.