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From The Collaborative International Dictionary of English v.0.48:
Residuum \Re*sid"u*um\ (-?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]