Shale Definition
- slate
- sediment
- clay
- rock
- sedimentary-rock
- silt rock
- schistous clay
Origin of Shale
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Middle English schale 'shell, husk; scale', from Old English scealu 'shell, husk, pod', from Proto-Germanic *skalō (compare West Frisian skaal 'dish', Dutch schaal 'shell', German Schale 'husk, pod'), from Proto-Indo-European *(s)kelo- 'split, cleaved' (compare Lithuanian skalà 'splinter', Old Church Slavonic skala 'rock, stone', Albanian halë 'fish bone, splinter', Sanskrit kalá 'small part'), from *(s)kel- 'to split, cleave' (compare Hittite iškalla 'to tear apart, slit open', Lithuanian skélti 'to split', Ancient Greek skállein 'to hoe, harrow').
From Wiktionary
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Probably from Middle English shell from Old English scealu skel-1 in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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