an annex of an ancient Roman basilica.
an annex or appendage, especially a narthex, of an early Christian basilica.
a city on Euboea, in SE Greece. a Greek island in the W Aegean Sea. 1586 sq. mi. (4110 sq. km). Capital: Chalcis. noun 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 […]
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