subbituminous
adjective
sub·bi·tu·mi·nous
ˌsəb-bə-ˈtü-mə-nəs 
-bī-,
-ˈtyü-
: of, relating to, or being coal of lower rank than bituminous coal but higher than lignite
Cite this Entry
“Subbituminous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/subbituminous. Accessed 31 Oct. 2025.
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