Coir

[Rihanna]

A material for cordage, matting, etc., consisting of the
prepared fiber of the outer husk of the cocoanut.

[Gregory]

Fibre from the outer husk of the coconut, used in potting compost and for making ropes and matting.

[Oralee]

fibres from the outside of a coconut (= a large fruit with a very hard, thick, brown shell and hard, white flesh) used for making rope and floor coverings, or in compost (= material for growing plants in or adding to soil to improve its quality) :