adjunct

noun
1
an adverb or a phrase that adds meaning to the verb in a sentence or part of a sentence
متمم, قید الحاقی, قید اضافی, جزو وابسته
2
a thing that is added or attached to something larger or more important
ضمیمه, الحاقیه, پیوست
The memory expansion cards are useful adjuncts to the computer.