buttonborder
nounUK /ˈbʌtənˌbɔːdə/
US /ˈbʌtənˌbɔːrdər/
A buttonborder is the line or edge around a button that shows where it ends.
The buttonborder was drawn in bright red so the button stood out on the page.
OTHER MEANINGS
2. The decorative trim sewn around the edge of a piece of clothing where buttons are fastened.
The tailor added a gold buttonborder along the coat's front.
3. In computing, the visible boundary style drawn around a clickable button in a user interface.
The designer changed the buttonborder to a rounded shape.
4. The raised ridge on a button that marks its outer limit.
She ran her thumb along the buttonborder of the old brass button.