archbraces
nounUK /ˈɑːtʃˌbreɪsɪz/
US /ˈɑrtʃˌbreɪsɪz/
Archbraces are strong curved supports that hold up a bridge or roof.
The old stone bridge stayed strong because of the archbraces underneath it.
OTHER MEANINGS
2. Curved metal bands worn on the teeth to straighten them.
The dentist said her archbraces would make her smile straighter.
3. Curved pieces that hold up the top of a doorway or window.
The archbraces above the window kept the bricks from falling.
4. Braces shaped like an arch used in building wooden ships.
The shipbuilder fitted archbraces to strengthen the hull.