Culm (kulm), n. [L. culmus stalk, stem; akin to calamus. SeeHalm.] (Bot.)

The stalk or stem of grain and grasses (including the bamboo), jointed and usually hollow.

© Webster 1913

Culm, n. [Perh. from W. cwlm knot or tie, applied to this species of coal, which is much found in balls or knots in some parts of Wales: cf. OE. culme smoke, soot.] (Min.)

(a)

Mineral coal that is not bituminous; anthracite, especially when found in small masses.

(b)

The waste of the Pennsylvania anthracite mines, consisting of fine coal, dust, etc., and used as fuel. Raymond.

© Webster 1913