noun
Technical term in mathematics and computing for the value or expression on which an operator acts. Often used in contrast with 演算子 (operator).
See also: オペランド
加算演算子の被演算子は、左辺と右辺の値です。
The operands of the addition operator are the left-hand and right-hand values.
この式では、被演算子が整数である必要があります。
In this expression, the operands must be integers.
Compound of 被 (ひ, 'receiving') + 演算子 (えんざんし, 'operator'), literally 'that which is operated upon'. A modern technical coinage.