The grain of a piece of wood
The word grain is used to describe the cells that make up the bulk of the wood tissue, or fibres, within a piece of flooring for example.
People often refer to wood splitting along the grain, meaning parallel to the fibres, whilst across the grain means perpendicular, or at 90°.
When looking at a piece of flooring from the factory of Parquets Castagné it is possible to see the grain and the direction it takes.
The word grain is also used when taking into account the position of growth rings in relation to the plane of cut and the appearance produced.
For example a tangential surface, one that runs parallel to the growth rings, is said to have tangential grain, if the surface is perpendicular then it has radial grain.