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countable and uncountable, plural culms
waste coal, used as a poor quality fuel; slack. quotations examples
Here he lay down on a place soft with culm, to take his contemplated rest, and, before he was aware of it, sleep had descended on him, overpowered him, and bound him fast.
1887, Homer Greene, chapter XXI, in Burnham Breaker
anthracite, especially when found in small masses examples
plural culms
(botany) the stem of a plant, especially of grass or sedge quotations examples
[…] because, upon hearing him out, she sank down on the lawn in an impossible posture, examining a grass culm and frowning, he had taken his words back at once; […]
1962, Vladimir Nabokov, Pale Fire, page 150