A bed, layer, or stratum of rock, esp. of an intrusive igneous rock. In modern use, a tabular igneous intrusion lying parallel to the surrounding…
| 单词 | θ4898 |
| 释义 | the world > the earth > structure of the earth > structural features > discontinuity or unconformity > [noun] > intrusion > sill (2) sill1794 A bed, layer, or stratum of rock, esp. of an intrusive igneous rock. In modern use, a tabular igneous intrusion lying parallel to the surrounding… whin-sill1839 a sill or layer of whinstone; also as a name for whinstone. |
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