Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Anatomy A seamlike line or ridge between two similar parts of a body organ, as in the scrotum.
  • n. Botany The portion of the funiculus that is united to the ovule wall, commonly visible as a line or ridge on the seed coat.
  • n. The median groove of a diatom valve.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A ridge or seam on an organ, bodily tissue, or other structure, especially at the join between two halves or sections.

from the GNU version of the Collaborative International Dictionary of English

  • n. A line, ridge, furrow, or band of fibers, especially in the median line.
  • n. Same as Rhaphe.

from The Century Dictionary and Cyclopedia

  • n. In botany: In an anatropous or amphitropous (hemitropous) ovule or seed, the adnate cord which connects the hilum with the chalaza, commonly appearing as a more or less salient ridge, sometimes completely embedded in a fleshy testa of the seed. See cuts under anatropous and hemitropous.
  • n. A longitudinal line or rib on the valves of many diatoms, connecting the three nodules when present. (See nodule.) The usual primary classification of genera depends upon its presence or absence.
  • n. In anatomy, a seam-like union of two lateral halves, usually in the mesial plane, and constituting either a median septum of connective tissue or a longitudinal ridge or furrow; specifically, in the brain, the median lamina of decussating fibers which extends in the tegmental region from the oblongata up to the third ventricle.
  • n. In ornithology, the groove along the under side of the rachis of a feather.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a ridge that forms a seam between two parts

Etymologies

New Latin, from Greek rhaphē, seam, suture, from rhaptein, to sew; see wer-2 in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Modern Latin, from Ancient Greek ῥαφή ("seam"). (Wiktionary)

Examples

  • Last year, Siver discovered a new genus of diatom (he has discovered 60 new species over the past 20 years) that sheds light on the origin of the "raphe" -- a slit that appears along the long axis of pennate diatoms.

    TreeHugger

  • The substance abounds in our bloodstreams, but our brains produce separate supplies via cells known as raphe nuclei.

    A Little Help From Serotonin

  • Because the underside of the shaft especially the central line called the raphe and the coronal ridge are more sensitive, many men find it more pleasurable when a woman places her hand “upside down” around the penis, with her thumb on the underside.

    Great Sex for Moms

  • A key brain serotonin circuit known as the raphe system, showed a dramatic reduction in the density of nerve fibers in the SSRI-exposed rats.

    Yahoo! News: Business - Opinion

  • Most antidepressants -- including the commonly used Prozac and Zoloft -- work by increasing the amount of serotonin, a message-carrying brain chemical made deep in the middle of the brain by cells known as raphe neurons.

    canada.com Top Stories

  • Most antidepressants - including the popular SSRIs - work by increasing the amount of serotonin made by cells -- called raphe neurons -- deep in the middle of the brain.

    Newswise: Latest News

  • Most antidepressants - including the commonly used Prozac and Zoloft - work by increasing the amount of serotonin, a message-carrying brain chemical made deep in the middle of the brain by cells known as raphe neurons.

    Medlogs - Recent stories

  • Most antidepressants - including the popular SSRIs - work by increasing the amount of serotonin made by cells-called raphe neurons-deep in the middle of the brain.

    Gaea Times (by Simple Thoughts) Breaking News and incisive views 24/7

  • When they treated mice with Mycobacterium vaccae they found that it did indeed activate a particular group of brain neurons that produce serotonin – in the interfascicular part of the dorsal raphe nucleus (DRI) of the mice, to be precise.

    Skip the Prozac and Spring Cleaning! Get Dirty! | Impact Lab

  • Along the median line (marked by the raphe) from the scrotum to the coccyx, and close to this line on either side, the vessels are unimportant as to size.

    Surgical Anatomy

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