raphe

noun

1. Anat. a seamlike joining of the two lateral halves of an organ, as of the tongue
2. Bot.
   1. a ridge of tissue along the side of an ovule, indicating the position of the vascular bundle which supplies the developing seed
   2. the line of union of the two carpels in the fruit of members of the umbel family
   3. a longitudinal fissure along the center of certain diatom shells