American Heritage Dictionary
(2)
Century Dictionary
(9)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
Coal from the Usibelli mine is classed as sub-bituminous, which has a lower energy content than bituminous and other higher-grade coals.— AlaskaJournal.com | Statewide Business News for the Last Frontier
I vividly recall learning about anthracite, bituminous, and lignite coal as a child in Pennsylvania, a state legendary for its coal production.— Interesting Thing of the Day
Next comes lignite, then sub-bituminous, bituminous, and in tectonically active regions -- anthracite.— WHAT REALLY HAPPENED
I must tell you that this coal is bituminous, and not anthracite I hope," said Ned, "that men's heads do not grow out of their sides, or from their breasts, and that they do not walk topsy-turvy, with their feet in the air No, they are not as bad as that," was the reply; "but you will see some queer things before you are through with Australia.— The Land of the Kangaroo Adventures of Two Youths in a Journey through the Great Island Continent
Like litharge, it may be employed in the preparation of drying oils, and, being a better drier than white lead, may be substituted for it in mixing with pigments which need a siccative, as the bituminous earths Minium sometimes leans to orange; and there is made from ceruse a peculiar red, Mineral Orange Orange Orpiment or Realgar, has also been called Red Orpiment, improperly, since it is a brilliant orange, inclining to yellow.— Field's Chromatography or Treatise on Colours and Pigments as Used by Artists

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word several times a year.
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