noun

1. A fine-grained homogeneous sedimentary rock composed of clay or volcanic ash which has been metamorphosed so that it cleaves easily into thin layers.

2. The bluish-grey colour of most slate.

3. A chalkboard, sheet of slate for writing on with chalk or with a thin rod of slate (a slate pencil) formerly commonly used by both students and teachers in schools

Synonyms: slate blue, slate gray, slate grey, account, bill

adjective

1. Having the bluish-grey/gray colour of slate.