Definitions

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

  • n. See navel.
  • n. Biology A small opening or depression similar to a navel, as the hollow at the base of the shell of some gastropod mollusks, one of the openings in the shaft of a feather, or the hilum of a seed.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. navel

from the GNU version of the Collaborative International Dictionary of English

  • n. The depression, or mark, in the median line of the abdomen, which indicates the point where the umbilical cord separated from the fetus; the navel; the belly button, in humans.
  • n. An ornamented or painted ball or boss fastened at each end of the stick on which manuscripts were rolled.
  • n. The hilum.
  • n.
  • n. A depression or opening in the center of the base of many spiral shells.
  • n. Either one of the two apertures in the calamus of a feather.
  • n.
  • n. One of the foci of an ellipse, or other curve.
  • n. A point of a surface at which the curvatures of the normal sections are all equal to each other. A sphere may be osculatory to the surface in every direction at an umbilicus. Called also umbilic.

from The Century Dictionary and Cyclopedia

  • n. In anatomy and zoology, the more or less nearly central point in the walls of the abdomen where the yolk-bag or umbilical vesicle of the embryo hangs, or where the navel-string or umbilical cord enters the belly; the navel; the omphalos.
  • n. Hence Some navel-like formation; some circumscribed depression or elevation; a sort of button, or a place in which a button might fit: when elevated instead of depressed, oftener called umbo.
  • n. In botany: [capitalized] An old generic name (A. P. de Candolle, 1801) for the navelwort, Cotyledon Umbilicus.
  • n. The part of a seed by which it is attached to the placenta; the hilum. See cut under hilum.
  • n. A depression or an elevation about the center of a given surface.
  • n. In antiquity, an ornamented or painted ball or boss fastened upon each end of the stick on which manuscripts were rolled.
  • n. In geometry, a term used by the older geometers as synonymous with focus; in modern works, a point in a surface through which all lines of curvature pass.
  • n. The raised central boss of a large plateau or dish, often made to fit the hollow foot of the ewer which stands upon it and forms one design with the dish.

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

  • n. a scar where the umbilical cord was attached

Etymologies

Latin umbilīcus; see nobh- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin umbilīcus ("navel"). (Wiktionary)

Examples

  • These are what is called the umbilicus, for this is a blood-vessel, consisting of one or more vessels in different animals.

    On the Generation of Animals

  • The umbilicus is a cicatrix formed after the metamorphosis of a median foetal structure -- the placental cord, &c.

    Surgical Anatomy

  • The upper jaw of the animal was fixed in the left side of the belly, forming a semicircular wound of which a point one inch to the left of the umbilicus was the upper boundary, and the lower part of the upper third of the thigh, the lower boundary.

    Anomalies and Curiosities of Medicine

  • The umbilicus is the external structure that is comprised of several structures that are necessary while the foal is in the womb.

    TheHorse.com News

  • The ruka sprang off and approached, trailing the noga's thick "umbilicus" across a shoulder.

    The Rebel Worlds

  • NAUKAASANA, PAVANAMUKTAASANA etc, which stimulate the VAATA STHAANA region of umbilicus which is supposed to remarkably and beneficially affect the spinal cord function.

    Recently Uploaded Slideshows

  • Above, in the glass-paneled theater, the chief and a group of residents looked on, as Jack inserted the Veress needle through a small nick just above the umbilicus and the abdomen inflated like a balloon.

    Three Stages of Amazement

  • One could not uniquely identify a criminal suspect on the grounds that he or she possesses a bellybutton (an umbilicus).

    A Disclaimer for Behe?

  • The madness that accompanies solitary months in the void can usually be kept at bay with communication – an invisible electronic umbilicus feeding us nutritional family contact and friendship.

    365 tomorrows » 2009 » February : A New Free Flash Fiction SciFi Story Every Day

  • This test usually confirms the diagnosis. cardiac catheterization – a thin tube is inserted into the heart through a vein and/or artery in either the leg or through the umbilicus (“belly button”)

    Tricuspid Atresia

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