Definition of "spilth"

I tempted his blood and his flesh, / Hid in roses my mesh, / Choicest cates and the flagon's best spilth— / Still he kept to his filth!

1855, Robert Browning, “Instans Tyrannus”, in Men and Women, lines 19–22

Like a vast spider suspended by a metal chord, a candelabrum presided over the room nine feet above the floor-boards. From its sweeping arms of iron, long stalactites of wax lowered their pale spilths drip by drip, drip by drip.

1946, Mervyn Peake, Titus Groan, London: Eyre & Spottiswoode

Baked fish lay cooling on the table, and there was a great spilth of wine on the floor.

1985, Anthony Burgess, Kingdom of the Wicked