end grain; cut end; cross section
Refers to the surface exposed when wood is cut across the grain, showing the tree rings. Used in woodworking and carpentry contexts.
Sand the end grain to make it smooth.
You can see beautiful tree rings on the cut end of this table.
Compound of 木 (ki, 'tree, wood') and 口 (kuchi, 'mouth, opening'), literally 'wood mouth', referring to the exposed end of a piece of wood.