• WordNet 3.6
    • n umbilicus a scar where the umbilical cord was attached "you were not supposed to show your navel on television","they argued whether or not Adam had a navel","she had a tattoo just above her bellybutton"
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Webster's Revised Unabridged Dictionary
    • Umbilicus (Zoöl) A depression or opening in the center of the base of many spiral shells.
    • Umbilicus (Geom) 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.
    • Umbilicus (Gr. & Rom. Antiq) An ornamented or painted ball or boss fastened at each end of the stick on which manuscripts were rolled.
    • Umbilicus (Zoöl) Either one of the two apertures in the calamus of a feather.
    • Umbilicus (Geom) One of the foci of an ellipse, or other curve.
    • Umbilicus (Anat) 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.
    • Umbilicus (Bot) The hilum.
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Century Dictionary and Cyclopedia
    • n umbilicus 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. With the absorption of the yolk-bag or the casting off of the navel-string, the umbilicus remains as a characteristic mark or scar. In man it is a little round pit or depression, its center, being hollowed in by the traction of the umbilical vessels inside the belly, as these degenerate into fibrous cords passing to the liver and to the bladder, forming the round ligament of the former and the urachus of the latter viscus.
    • n umbilicus 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. Specifically— In conchology, a circular and more or less centric pit or hollow of the body-whorl of a spiral shell; an umbilicated formation. It is well shown in the figure of the snail herewith.
    • n umbilicus In botany: [capitalized] An old generic name (A. P. de Candolle, 1801) for the navelwort, Cotyledon Umbilicus.
    • n umbilicus The part of a seed by which it is attached to the placenta; the hilum. See cut under hilum.
    • n umbilicus A depression or an elevation about the center of a given surface.
    • n umbilicus In antiquity, an ornamented or painted ball or boss fastened upon each end of the stick on which manuscripts were rolled.
    • n umbilicus 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 umbilicus 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.
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Chambers's Twentieth Century Dictionary
    • n Umbilicus the navel: a depression at the axial base of a spiral shell, as in many gasteropods
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Webster's Revised Unabridged Dictionary
L. See Umbilic
Chambers's Twentieth Century Dictionary
L. umbilīcus, the navel; Gr. omphalos.


In literature:

Sennert writes of menstruation from the groin associated with hemorrhage from the umbilicus and gums.
"Anomalies and Curiosities of Medicine" by George M. Gould
In such cases the external umbilicus alone affords a certain indication of the position of the future embryo.
"Narrative of a Survey of the Intertropical and Western Coasts of Australia] [Volume 2 of 2]" by Phillip Parker King
Seeds solitary, or two in cells, shell-like testa, marked with the ventral umbilicus.
"The Commercial Products of the Vegetable Kingdom" by P. L. Simmonds
On examination the spleen was decidedly large; the lower border of the stomach reached to the level of the umbilicus.
"Fat and Blood" by S. Weir Mitchell
Infection takes place through the umbilicus, and manifests itself clinically by spasms of the muscles of mastication.
"Manual of Surgery" by Alexis Thomson and Alexander Miles
In respect to Delphi, they presumed that it was the umbilicus, or centre of the whole earth.
"A New System; or, an Analysis of Antient Mythology. Volume I." by Jacob Bryant
SYMPTOMS: A soft, puffy swelling about the navel or umbilicus, varying in size from a hazelnut to that of an ostrich egg.
"The Veterinarian" by Chas. J. Korinek
Care should always be exercised in washing the umbilicus.
"The Mother and Her Child" by William S. Sadler
The umbilicus of newly-born children is inevitably tied by a doctor and not by a member of the family, as with some nations.
"Across Coveted Lands" by Arnold Henry Savage Landor
Umbilicus: a navel, or navel-like depression.
"Explanation of Terms Used in Entomology" by John. B. Smith

In poetry:

Dog-head, devourer:
Feed me the berries of dark.
The lids won't shut. Time
Unwinds from the great umbilicus of the sun
Its endless glitter.
"Maenad" by Sylvia Plath
Dragging their Jesus hair.
Did I escape, I wonder?
My mind winds to you
Old barnacled umbilicus, Atlantic cable,
Keeping itself, it seems, in a state of miraculous
"Medusa" by Sylvia Plath