Philosopher's wool

//fɪˌlɒsəfəz ˈwʊl// noun

Definitions

Noun
  1. 1
    Zinc oxide (chemical formula ZnO) as a white flocculent powder. archaic, uncountable
  2. 2
    oxide of zinc; a white powder used as a pigment or in cosmetics or glass or inks and in zinc ointment wordnet

Etymology

From philosopher (“(obsolete) an alchemist”) + -’s + wool.

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