What is frothy matter raised on liquids by boiling, effervescence, or agitation; froth; foam; scum. Materials dark and crude, Of spiritous and fiery spume. Milton called?

spume — Frothy matter raised on liquids by boiling, effervescence, or agitation; froth; foam; scum. Materials dark and crude, Of spiritous and fiery spume. Milton. (Webster's 1913.)

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