† fossil wooln.Obsolete a fibrous variety of asbestos.
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1859 D. PageHandbk. Geol. Terms 170Fossil-Paper, Fossil-Wool,..familiar terms applied to certain varieties of amianthus.
1892 M. P. BalePumps & Pumping (ed. 2) i. 19 The author has found slag wool, thick hair felt lagged with wool, and fossil wool all answer well for pipe coverings.