古英語のscealu, shell, scaleから。原語ゲルマン語*skalo, to slice, to sliceから。PIE*skel, to cut, to separateから。語源的にはscale, shellと同じ。
英語の語源
shale
shale: see scale
shale (n.)
1747, possibly a specialized use of Middle English schale "shell, husk, pod" (late 14c.), also "fish scale," from Old English scealu (see shell (n.)) in its base sense of "thing that divides or separate," in reference to the way the rock breaks apart in layers. Compare Middle English sheel "to shell, to take off the outer husk" (late 15c.). Geological use also possibly influenced by German Schalstein "laminated limestone," and Schalgebirge "layer of stone in stratified rock."
例文
1. We must find economical methods for extracting oil from shale .
シェールから採油するための経済的な方法を見つけなければなりません.
2.We can extract oil from shale .
シェールから石油を抽出することができます。
3.More ammonium sulphate solution is being recovered in the process of distilling oil shale .
オイルシェールの精製中に回収された硫酸アンモニウム液は過去よりも多い。
4.The limestone，sandstone and shale of this area were soft.
この地域の灰岩、砂岩、シェールは柔らかい。
5.Thin layers of sandy shale ，and carbonaceous fragments are locally present.