rock coal
chiefly US in later use (now rare )
noun
A hard form of coal; anthracite.
Origin
Mid 18th century.
- autocatalytically
- autocentric
- autocentrism
- autocephalic
- autocephalous
- autocephaly
- autochange
- autochanger
- autochrome
- autochthon
- autochthonal
- autochthonic
- autochthonism
- autochthonist
- autochthonous
- autochthonously
- autochthony
- autochtony
- autocidal
- autocide
- autoclastic
- autoclave
- auto club
- autocode
- autocoherer