Source : Webster's Revised Unabridged Dictionary (1913)

Operand \Op"er*and\, n. [From neuter of L. operandus, gerundive
   of operari. See {Operate}.] (Math.)
   The symbol, quantity, or thing upon which a mathematical
   operation is performed; -- called also {faciend}.

Source : WordNet®

operand
     n : a quantity upon which a mathematical operation is performed

Source : Free On-Line Dictionary of Computing

operand
     
         An {argument} of an {operator} or of a {machine
        language} instruction.
     
        (1995-08-18)