The word “culm” refers to a few different concepts, primarily in botany and geology. In botany, culm is the term used to describe the stem of grasses and some other plants, particularly in the context of describing their growth and structural characteristics. In geology, culm can refer to a type of slate or a specific coal-bearing rock formation, particularly in relation to formations that contain a high proportion of organic material. The exact meaning can depend on the context in which it is used.
