slate

noun

1.
(formerly) a writing tablet made of slate
board stone
2.
thin layers of rock used for roofing
slating
Derived from:
slate
3.
a fine-grained metamorphic rock that can be split into thin layers
Chinese 板岩 lit shindlestone
4.
a list of candidates nominated by a political party to run for election to public offices
ticket
Derived from:
slate