faciend

from The Collaborative International Dictionary of English v.0.48

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}.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Faciend \Fa"ci*end\, n. [From neut. of L. faciendus, gerundive
   of facere to do.] (Mach.)
   The multiplicand. See {Facient}, 2.
   [1913 Webster]