Dictionary
subbituminous
adjective sub·bi·tu·mi·nous \ˌsəb-bə-ˈtü-mə-nəs, -bī-, -ˈtyü-\
Definition of SUBBITUMINOUS
: of, relating to, or being coal of lower rank than bituminous coal but higher than lignite
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First Known Use of SUBBITUMINOUS
1908
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