[ sem-ee-bi-too-muh-nuhs, -tyoo-, sem-ahy-, sem-ee-, sem-ahy- ]
/ ˈsɛm i bɪˈtu mə nəs, -ˈtyu-, ˈsɛm aɪ-, ˌsɛm i-, ˌsɛm aɪ- /
a coal intermediate between bituminous and anthracite coal in hardness, yielding the maximum heat of any ordinary steam coal.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020