Source : Webster's Revised Unabridged Dictionary (1913)

Coir \Coir\ (koir), n. [Tamil kayiru.]
   1. A material for cordage, matting, etc., consisting of the
      prepared fiber of the outer husk of the cocoanut.
      --Homans.

   2. Cordage or cables, made of this material.

Source : WordNet®

coir
     n : stiff coarse fiber from the outer husk of a coconut