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

First Known Use of SUBBITUMINOUS

1908

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