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English definition of “slate”

slate

noun [C or U] (ROCK)    /sleɪt/
a dark grey rock that can be easily divided into thin pieces, or a small, thin piece of this used to cover a roofTypes of rockPrecious and semi-precious stonesRoofs and parts of roofsBuilding materials
(Definition of slate noun (ROCK) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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