Artificial intelligent assistant

pumiceous

pumiceous, a.
  (pjuːˈmɪʃəs)
  [f. L. pūmice-us (f. pūmex, -icem) + -ous.]
  Consisting of pumice; having the character or texture of pumice.

1676 H. More Remarks 10 If one side be pumiceous..and the other metalline, the metalline will gravitate on the pumiceous or spungie side. 1796 Kirwan Elem. Min. (ed. 2) I. 416, I should..call them pumiceous mixtures. 1869 Phillips Vesuv. ii. 35 Pompeii was overwhelmed with light-coloured pumiceous lapilli.

Oxford English Dictionary

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