The term COARSE FIBER OF A COCONUT can be summarized as COIR, a four letter word. Coir is a coarse fiber extracted from the husk of coconuts. It is used in various industries such as rope making, matting, and upholstery stuffing. Coir is also used in horticulture as a soil-less growing medium. It is an environmentally friendly material that is biodegradable and has good water retention properties.