Compare this word with "suture". It has a comparable origin,
but its use is rather restricted.
raphe

SYLLABICATION: ra·phe
PRONUNCIATION: rf
VARIANT FORMS: also rha·phe
NOUN: Inflected forms: pl. ra·phae (-f)
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.
ETYMOLOGY: New Latin, from Greek rhaph, seam, suture, from rhaptein, to sew. See wer-2 in Appendix I.

Cf."Rhapsody" from same root, very different meaning.
rhapsody

SYLLABICATION: rhap·so·dy
PRONUNCIATION: rps-d
NOUN: Inflected forms: pl. rhap·so·dies
1. Exalted or excessively enthusiastic expression of feeling in speech or writing. 2. A literary work written in an impassioned or exalted style. 3. A state of elated bliss; ecstasy. 4. Music A usually instrumental composition of irregular form that often incorporates improvisation. 5. An ancient Greek epic poem or a portion of one suitable for uninterrupted recitation.
ETYMOLOGY: Latin rhapsdia, section of an epic poem, from Greek rhapsidi, from rhapsidein, to recite poems : rhaptein, rhaps-, to sew; see wer-2 in Appendix I + aoid, id, song; see wed-2 in Appendix I.