The Collaborative International Dictionary of English v.0.48:

Fimbria \Fim"bri*a\, n.; pl. Fimbri[ae]. [L., fringe. See
   Fringle.] (Anat.)
   (a) pl. A fringe, or fringed border.
   (b) A band of white matter bordering the hippocampus in the
       brain. -- Fim"bri*al, a.
       [1913 Webster]