Shrinkage across the annual rings — the wide dimension of a flatsawn board. Always greater than radial shrinkage; usually about twice as much.
Tangential shrinkage is why flatsawn tabletops need slotted hardware.
A cut where annual rings run roughly parallel to the face of the board. Shows cathedral grain on the face. Cheapest yield from a log; moves most across the face.
Shrinkage along the rays — the wide dimension of a quartersawn board. Roughly half the tangential value, making quartersawn the most stable cut.