seam of joined boards
Refers to the visible line or joint where two boards meet, especially in woodworking or carpentry.
The seams of the boards on this table are neatly aligned.
cross grain (of wood)
Describes the grain pattern on the face of a board when it is cut tangentially to the growth rings; the opposite of 柾目 (まさめ), which is the straight grain.
Cross-grain boards tend to warp more easily than straight-grain boards.
thick card made from several sheets of washi paper
Abbreviation of 板目紙 (いためがみ). Refers to a stiff, layered paperboard used for crafts, bookbinding, or packaging.
See also: 板目紙
I made a cover using thick washi card.