slate
nounfeminine/ɐɾ.ðu.ˈzi.ɐ/medium
ar·do·si·a
Definition
A fine-grained metamorphic rock that splits into thin, smooth layers, typically grey or bluish, used for roofing, flooring, and blackboards.
The old cottage had a slate roof.
He wiped the slate clean.
syn
Common collocations
slate roofslate tileslate blackboard
Etymology
Do latim 'lapis ardesia'.