Operand vs. Opcode

Operandnoun

A quantity to which an operator is applied (in 3 - x, the operands of the subtraction operator are 3 and x).

Operandnoun

The symbol, quantity, or thing upon which a mathematical operation is performed; - called also faciend.

Operandnoun

a quantity upon which a mathematical operation is performed

Operand

In mathematics an operand is the object of a mathematical operation, i.e., it is the object or quantity that is operated on.

Opcodenoun

(computing) A mnemonic used to refer to a microprocessor instruction in assembly language.

Opcodenoun

2010 and the .NET 4 Platform (page 655)

Opcode

In computing, an opcode (abbreviated from operation code, also known as instruction machine code, instruction code, instruction syllable, instruction parcel or opstring) is the portion of a machine language instruction that specifies the operation to be performed. Beside the opcode itself, most instructions also specify the data they will process, in the form of operands.