culm

1 [kuhlm]
noun
1.
coal dust; slack.
2.
anthracite, especially of inferior grade.

Origin:
1300–50; Middle English colme, probably equivalent to col coal + -m suffix of uncertain meaning (compare -m in Old English fæthm fathom, wæstm growth)

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culm

2 [kuhlm]
noun
1.
a stem or stalk, especially the jointed and usually hollow stem of grasses.
verb (used without object)
2.
to grow or develop into a culm.

Origin:
1650–60; < Latin culmus stalk; akin to calamus, haulm

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
culm1 (kʌlm)
 
n
1.  coal-mine waste
2.  inferior anthracite
 
[C14: probably related to coal]

culm2 (kʌlm)
 
n
the hollow jointed stem of a grass or sedge
 
[C17: from Latin culmus stalk; see haulm]

Culm or Culm Measures
 
n
a formation consisting mainly of shales and sandstone deposited during the Carboniferous period in parts of Europe
 
[C19: from culm1]
 
Culm Measures or Culm Measures
 
n
 
[C19: from culm1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
culm   (kŭlm)  Pronunciation Key 
The stem of a grass or similar plant.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Anthracite culm availability is more than sufficient for the demonstration period.
The leaves of the lower culm become light deprived as the plant grows and are replaced with new leaves higher up the culm.
Plants that flowered early and had reduced culm length were identified as mutants and harvested individually.
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