Definition of slate:

part of speech: verb

To cover or roof with slates.

part of speech: adjective

Made or consisting of slate.

part of speech: noun

Any rock that can be split into thin laminae or plates; argillaceous rocks whose lamination is produced by cleavage; a thin plate of stone for roofing, or for writing on; foliated rocks, like gneiss and mica- schist, are termed schists and not slates; thinly- bedded sandstones are called flagstones or tilestones.

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