Definition of "spume"

Materials dark and crude, / Of spiritous and fiery spume.

1667, John Milton, “Book VI”, in Paradise Lost. […], London: […] [Samuel Simmons], […]; republished as Paradise Lost in Ten Books: […], London: Basil Montagu Pickering […], 1873,

No sluggish tide congenial to the glooms; / This, as it frothed by, might have been a bath / For the fiend's glowing hoof - to see the wrath / Of its black eddy bespate with flakes and spumes.

1855, Robert Browning, Childe Roland to the Dark Tower Came, section XIX

The desert storm was riding in its strength; the travellers lay beneath the mastery of the fell simoom. […] Roaring, leaping, pouncing, the tempest raged about the wanderers, drowning and blotting out their forms with sandy spume.

1892, James Yoxall, chapter 5, in The Lonely Pyramid

Their breath froze in the air as it left their mouths, spouting forth in spumes of vapour that settled upon the hair of their bodies and formed into crystals of frost.

1906 May–October, Jack London, chapter I, in White Fang, New York, N.Y.: The Macmillan Company; London: Macmillan & Co., published October 1906, part 1 (The Wild)

A strong sea wind lashed at his city suit, salt rain stung his eyes, balls of spume skimmed across his path.

1986, John le Carré, A Perfect Spy