Source : Webster's Revised Unabridged Dictionary (1913)

Striation \Stri*a"tion\, n.
   1. The quality or condition of being striated.

   2. A stria; as, the striations on a shell.

Source : WordNet®

striation
     n 1: any of a number of tiny parallel grooves such as: the
          scratches left by a glacier on rocks or the streaks or
          ridges in muscle tissue [syn: {stria}]
     2: a stripe of contrasting color; "chromosomes exhibit
        characteristic bands" [syn: {band}, {stria}]