anthracitismn.
/ˈanθrəsʌɪˌtɪz(ə)m/, U.S. /ˈænθrəˌsaɪdɪz(ə)m/ Geology. Now rare.
The state (of coal) of having been converted into anthracite; anthracitization.
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anthracitism1878
1878 J. Le Conte Elements Geol. iii. iii. 346 High heat is not necessary to produce anthracitism.
1908 Nature 12 Nov. 33/2 The degree of anthracitism of each sample is expressed by the factor representing the relation of carbon to hydrogen.
1920 Coal Catal. iii. 191 The most favorable position for an igneous rock to produce anthracitism in a coal seam is for it to be a little below the coal.
This entry has been updated (OED Third Edition, March 2016; most recently modified version published online December 2021).
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n.1878