ˈ ̷ ̷ˌ ̷ ̷ noun
also buckstave ˈ ̷ ̷ˌ ̷ ̷
( -s )
Etymology: buck (I) (steel support) + stay or stave
: either of two connected girders used one on each side of the masonry structure of a furnace or flue to take the thrust of an arch ; also : any girder similarly used as a stay