minuend

from WordNet (r) 3.0 (2006)

minuend
    n 1: the number from which the subtrahend is subtracted

from The Collaborative International Dictionary of English v.0.48

minuend \min"u*end\, n. [L. minuendus to be diminished, fr.
   minuere to lessen, diminish. See {Minish}.] (Arith.)
   In the process of subtraction[2], the number from which
   another number (the subtrahend) is to be subtracted, to find
   the difference.
   [1913 Webster +PJC]