Slat (noun)

1. A thin flat strip of wood or other material.
2. A narrow flat strip of material in a piece of furniture or equipment.

Origin:

Late 17th century: probably from dutch slat "rod, bar", of germanic origin.

Examples:

1. The bed had a slat missing.
2. The old window had wooden slats that let in light and fresh air.
3. He replaced the broken slat in the fence.
4. The slats of the blinds were closed to block out the sun.
5. The slats in the old chair were loose and needed to be tightened.