The Collaborative International Dictionary of English v.0.48:

Stria \Stri"a\, n.; pl. Striae. [L., a furrow, channel,
   hollow.]
   1. A minute groove, or channel; a threadlike line, as of
      color; a narrow structural band or line; a striation; as,
      the striae, or groovings, produced on a rock by a glacier
      passing over it; the striae on the surface of a shell; a
      stria of nervous matter in the brain.
      [1913 Webster]

   2. (Arch.) A fillet between the flutes of columns, pilasters,
      or the like. --Oxf. Gloss.
      [1913 Webster]