mass noun
1
- a solid material which is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity (e.g. iron, gold, silver, copper, and aluminium, and alloys such as brass and steel)金属：
vessels made of ceramics or metal
用瓷器或金属做的容器
count noun being a metal, aluminium readily conducts heat.铝是金属, 所以导热性能好。
1.1
metals
the steel tracks of a railway（铁路的）钢轨。
1.2
- Heraldry gold and silver (as tinctures in blazoning)【纹章】金属色（装饰纹章时用作色彩的金和银色）。
2
- （亦作road metal）broken stone for use in road-making筑路碎石。
3
- molten glass before it is blown or cast玻璃液。
4
- heavy metal or similar rock music重金属音乐（或类似的摇滚乐）。
(metalled, metalling; <北美> metaled, metaling) with obj. ［usu. as adj. metalled］
1
- make out of or coat with metal用金属做; 用金属包：
a range of metalled key rings.
各式各样的金属钥匙环。
2
- Brit. make or mend (a road) with road metal〈英〉用碎石筑（路）; 用碎石修（路）：
follow the metalled road for about 200 yards.
沿着碎石路约走200码。
词源
Middle English: from Old French metal or Latin metallum, from Greek metallon 'mine, quarry, or metal'.