ra·phe also rha·phe 
(rāfē′)
(rāfē′)n. pl. ra·phae (-fē′) also rha·phae
1. Anatomy A seamlike line or ridge between two similar parts of a body organ, as in the scrotum.
2. Botany The portion of the funiculus that is united to the ovule wall, commonly visible as a line or ridge on the seed coat.
3. The median groove of a diatom valve.
[New Latin, from Greek rhaphē, seam, suture, from rhaptein, to sew; see wer-2 in the Appendix of Indo-European roots.]