Culm
From BiblePortal Wikipedia
Webster's Dictionary [1]
(1): (n.) Mineral coal that is not bituminous; anthracite, especially when found in small masses.
(2): (n.) The stalk or stem of grain and grasses (including the bamboo), jointed and usually hollow.
(3): (n.) The waste of the Pennsylvania anthracite mines, consisting of fine coal, dust, etc., and used as fuel.