In Arithmetic:
A number from which another number is to be subtracted is known as Minuend E.g. 20  5 In the above arithmetic expression, 20 is a Minuend
Consider the following figure illustrating Minuend:
In Algebra: An algebraic number from which another algebraic number is to be subtracted is known as Minuend E.g. 2a  2b In the above algebraic expression, 2a is a Minuend
Consider the following figure illustrating Minuend:

