GNU Collaborative International Dictionary of English

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1.       
   Residuum (-?m), n. [L. See Residue.] That which is left after any process of separation or purification; that which remains after certain specified deductions are made; residue.
   
   [1913 Webster]
   
   “I think so,” is the whole residuum . . . after evaporating the prodigious pretensions of the zealot demagogue. L. Taylor.
   
   [1913 Webster]