| 词汇 | au |
| 词源 | Au; gold. Au, an abbreviation of the Latin aurum, is the chemical symbol for gold, which is itself one of the four old- est words in English, deriving from the Indo-European sub- strate word gol (the other three are apple, from apal; bad, bad; and tin, tin). Hundreds of expressions, some of them covered in these pages, are based on gold, from all that glit- ters is not gold and good as gold to heart of gold and gold dig- ger. Various kinds of real or counterfeit gold include the following: Argental gold, electrum—an alloy of gold and silver. Colored gold—gold whose luster is destroyed by nitric acid. Dead gold—colored gold. Fool’s gold—iron or copper pyrites, sometimes mistaken for gold. Green gold—gold alloyed with silver. Jeweler’s gold—an alloy containing three parts silver to one of gold. Leprous gold—lead. Mannheim gold—an alloy containing copper, tin, and zinc. Mock gold—an alloy of copper, zinc, and platinum. Red gold—gold alloyed with copper. Shell gold—a gold put into shells by miners. Spangle gold—gold beaten for spangles. White gold—an alloy of about five parts silver to one of gold. |
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