Source : Webster's Revised Unabridged Dictionary (1913)

Despumate \Des"pu*mate\, v. t. & i. [imp. & p. p. {Despumated};
   p. pr. & vb. n. {Despumating}.] [L. despumatus, p. p. of
   despumare to despume; de- + spumare to foam, froth, spuma
   froth, scum.]
   To throw off impurities in spume; to work off in foam or
   scum; to foam.