- Any of various forms of protective coverings for the head, usually made of a hard material, including the outside steel layer of helmets that consist of inner and outer parts.
- Roman silver coins of several valuations, originating at one-half denarius, produced beginning in the late 3rd century BCE; later also of gold or bronze and issued until the 3rd century CE.
- Refers to the period in history and style of art that developed when Rome was ruled by the Republic, from its founding in 509 BCE through the Battle of Actium in 31 BCE or the formal establishment of the Empire in 27 BCE. Art produced during this period reflects the political power, glories, and distinguished ancestors of the ruling families, resulting in many portraits and historical reliefs. The style is characterized by the influence of Classical Greek art and an emphasis on extreme realism.
- Pure metallic element having symbol Ag and atomic number 47; a malleable, ductile, white metal with characteristic sheen, considered a precious metal. Silver is widely distributed throughout the world, occurring rarely as metallic silver (in Peru, Norway) but more often as silver-gold alloys and silver ore. Today silver is obtained as a byproduct in the refinement of gold, lead, copper, or zinc ores. Silver was smelted from the ore galena as early as 3800 BCE. As a pure metal, silver is second to gold in malleability and ductility, can be polished to a highly reflective surface, and used -- typically in an alloy -- in jewelry, coinage, photography, mirrors, electrical contacts, and tableware.
- Conventionalized figures derived from astronomical stars, having radiating points of any number.
- Two siblings conceived, carried in the womb, and usually born at the same time. They may be identical, as when one fertilized egg splits, or fraternal, as when two eggs are individually fertilized.
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