Culm
Culm (kulm) , noun
[Latin culmus stalk, stem; akin to calamus. SeeHalm.]
(Botany) The stalk or stem of grain and grasses (including the bamboo), jointed and usually hollow.
Culm , noun
[Perh. from Welsh cwlm knot or tie, applied to this species of coal, which is much found in balls or knots in some parts of Wales: compare Old English culme smoke, soot.]
(a)
(Mineralogy) Mineral coal that is not bituminous; anthracite, especially when found in small masses.
(b)
(Mineralogy) The waste of the Pennsylvania anthracite mines, consisting of fine coal, dust, etc., and used as fuel. — Raymond