Refers to a shelf board or shelving in general, often used in contexts like furniture, storage, or construction.
The shelf board of the bookcase is starting to sag.
board of a ship's planking
Dated nautical term for a plank used in traditional Japanese shipbuilding. Rare in modern usage.
I added extra shelving to increase storage space.
The planking boards of old Japanese ships were made of thick cedar planks.
Compound of 棚 (tana, 'shelf') and 板 (ita, 'board'). The reading たないた is a straightforward combination.