名詞 culm:

1. stem of plants of the Gramineae

culm

n.（名詞）
The stem of a grass or similar plant.
空心桿：草或類似植物的莖

來源：
Latin culmus [stalk]
拉丁語 culmus [主莖]

culm
culm 2

n.（名詞）
Waste from anthracite coal mines, consisting of fine coal, coal dust, and dirt.
無煙煤廢渣：無煙煤煤礦的廢棄物，由細(xì)粒無煙煤、煤塵和塵土構(gòu)成

Carboniferous shale.
碳質(zhì)頁巖
Inferior anthracite coal.
劣質(zhì)無煙煤

來源：
Middle English colme [coal dust]
中古英語 colme [煤塵]
perhaps from Old English col [coal]
可能源自 古英語 col [煤]