Coarse fiber (4)
I believe the answer is:
coir
(Other definitions for coir that I've seen before include "Coconut husk fibre used for making matting" , "growing medium" , "Fibre from coconut husks" , "Coarse fibre from a coconut husk" .)
I believe the answer is:
coir
(Other definitions for coir that I've seen before include "Coconut husk fibre used for making matting" , "growing medium" , "Fibre from coconut husks" , "Coarse fibre from a coconut husk" .)