shale

中文： 页岩

1. A shell, scale or husk; a cod or pod. (countable, uncountable)
2. A fine-grained sedimentary rock of a thin, laminated, and often friable, structure. (countable, uncountable)
3. The shale oil and shale gas segment of the oil and gas industry. (countable, uncountable)

复数 shales