单词 | gold |
释义 | gold ![]() n. 1. a. Symbol Au A soft, yellow, corrosion-resistant element, the most malleable and ductile metal, occurring in veins and alluvial deposits and recovered by mining, panning, or sluicing. A good thermal and electrical conductor, gold is generally alloyed to increase its strength, and it is used as a common monetary standard, in jewelry, for decoration, and as a plated coating on a wide variety of electrical and mechanical components. Atomic number 79; atomic weight 196.967; melting point 1,064.2°C; boiling point 2,856.0°C; specific gravity 19.3; valence 1, 3. See Periodic Table. b. Coinage made of this element. c. A gold standard. 2. Money; riches. 3. A light olive-brown to dark yellow, or a moderate, strong to vivid yellow. 4. Something regarded as having great value or goodness: a heart of gold. 5. A medal made of gold awarded to one placing first in a competition, as in the Olympics: won 9 golds in 13 events. adj. Having the color of gold. [Middle English, from Old English; see ghel-2 in the Appendix of Indo-European roots.] |
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