The Collaborative International Dictionary of English v.0.48:

Raphe \Ra"phe\ (r[=a]"f[-e]), n. [NL., fr. Gr. "rafh` a seam or
   suture, fr. "ra`ptein to sew or stitch together.]
   1. (Anat.) A line, ridge, furrow, or band of fibers,
      especially in the median line; as, the raphe of the
      tongue.
      [1913 Webster]

   2. (Bot.) Same as Rhaphe.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Rhaphe \Rha"phe\, n. [NL., fr. Gr. ??? seam, fr. ??? to sew. ]
   (Bot.)
   The continuation of the seed stalk along the side of an
   anatropous ovule or seed, forming a ridge or seam. [Written
   also raphe.] --Gray.
   [1913 Webster]

WordNet (r) 3.0 (2006):

raphe
    n 1: a ridge that forms a seam between two parts [syn: raphe,
         rhaphe]