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Meaning of semibituminous coal

sem'i•bi•tu'mi•nous coal'

Pronunciation: (sem'ē-bi-t'mu-nus, -ty'-, sem'ī-, sem"ē-, sem"ī-), [key]
  1. a coal intermediate between bituminous and anthracite coal in hardness, yielding the maximum heat of any ordinary steam coal.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.