The Collaborative International Dictionary of English v.0.48:

Striation \Stri*a"tion\, n.
   1. The quality or condition of being striated.
      [1913 Webster]

   2. A stria; as, the striations on a shell.
      [1913 Webster]

WordNet (r) 3.0 (2006):

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, striation]
    2: a stripe or stripes of contrasting color; "chromosomes
       exhibit characteristic bands"; "the black and yellow banding
       of bees and wasps" [syn: band, banding, stria,
       striation]