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shaleMain Entry: shale Pronunciation: \ˈshāl\ Function: noun Etymology: probably from obsolete or dial. shale scale, shell, from Middle English, from Old English scealu — more at shell Date: 1747 : a fissile rock that is formed by the consolidation of clay, mud, or silt, has a finely stratified or laminated structure, and is composed of minerals essentially unaltered since deposition — shal·ey also shaly \ˈshā-lē\ adjective
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