- coal dust; slack.
- anthracite, especially of inferior grade.
- a stem or stalk, especially the jointed and usually hollow stem of grasses.
- to grow or develop into a culm.
- coal-mine waste
- inferior anthracite
- the hollow jointed stem of a grass or sedge
- a formation consisting mainly of shales and sandstone deposited during the Carboniferous period in parts of Europe
