This is an irregular feature - both in frequency and oddness - dedicated to a word I came across that I have never previously used.
coir (KOY-ehr) n. a stiff and somewhat coarse fiber derived from the outer husk of a coconut.
Derived from the Malayalam language, coir is the Anglified version of kayar, meaning "cord." While typically used for making rope and floor matting, coir also has uses as a renewable potting compost, serving as an excellent substitute for peat moss.
The fiber is also known for its waterproof nature, as well as for the fact that it is resistant to salt. For this reason coir mats are useful in coastal settings, or in areas like Northwest Ohio that use salt to melt snow and ice.
Sri Lanka, India and the Philippines are the world's largest producers of coir, and tens of thousands of residents on the island of Sri Lanka generate approximately one million cubic meters of coir each year.