Longman Dictionary of Contemporary English
scroll bar
noun
EXAMPLES FROM CORPUS
▪ A scroll bar with up and down arrows above and below lets you move through the contents.
▪ A scroll bar, called the timeline, lets you grab information by date.
Wiktionary
scroll bar
alt. (context computing English) a graphical widget in the form of a horizontal or vertical bar, on the edges of a personal computer screen, that is used to move scrollable text or images n. (context computing English) a graphical widget in the form of a horizontal or vertical bar, on the edges of a personal computer screen, that is used to move scrollable text or images