What is "straight-joint"

Straight-joint \Straight"-joint`\, a. (Arch.) Having straight joints. Specifically:

1. 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.

2. In the United States, applied to planking or flooring put together without the tongue and groove, the pieces being laid edge to edge.

a. 1 (context architecture of a floor English) Whose boards are laid so that the joints form a continued line transverse to the length of the boards themselves. 2 (context architecture US of flooring or planking English) Put together without the tongue and groove, the pieces being laid edge to edge.