neptune

noun neptune

• copernican system — the theory published in 1543 by Copernicus which stated that the earth and the planets rotated around the sun and which opposed the Ptolemaic system
• mercury — Chemistry. a heavy, silver-white, highly toxic metallic element, the only one that is liquid at room temperature; quicksilver: used in barometers, thermometers, pesticides, pharmaceutical preparations, reflecting surfaces of mirrors, and dental fillings, in certain switches, lamps, and other electric apparatus, and as a laboratory catalyst. Symbol: Hg; atomic weight: 200.59; atomic number: 80; specific gravity: 13.546 at 20°C; freezing point: −38.9°C; boiling point: 357°C.
• mars — (used chiefly in representation of southern black speech) master.