Definify.com
Webster 1913 Edition
Straight-joint
Straight′-jointˊ
,Adj.
(Arch.)
Having straight joints.
Specifically: (a)
Applied to a floor the boards of which are so laid that the joints form a continued line transverse to the length of the boards themselves.
Brandle & C.
(b)
In the United States, applied to planking or flooring put together without the tongue and groove, the pieces being laid edge to edge.