fossilityn.
Editorial or compositorial misreading of fissility n.Explained in J. E. Worcester Dict. Eng. Lang. (1860) as ‘the quality or state of a fossil’.
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fossility1845
1845 Penny Cycl. Suppl. I. 374/1 Cleavage, a term employed in geology to indicate a peculiar fossility in certain (especially argillaceous) rocks.
This entry has been updated (OED Third Edition, November 2010; most recently modified version published online September 2021).
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n.1845