cornerboard

English

Noun

cornerboard (plural cornerboards)

1. (architecture) A length of trim or molding used in construction to cover the external corners of a building.
   • 2010, Aaron Lubeck, Green Restorations: Sustainable Building and Historic Homes:

     A 5⁄4 cornerboard furred out 1⁄4 inch gives a matching shadowline to a 11⁄2-inch original cornerboard