Dictionary » U » Umbilicus



1. (Science: anatomy) The depression, or mark, in the median line of the abdomen, which indicates the point where the umbilical cord separated from the foetus; the navel.

2. An ornamented or painted ball or boss fastened at each end of the stick on which manuscripts were rolled.

3. (Science: botany) The hilum.

4. (Science: zoology) A depression or opening in the center of the base of many spiral shells. Either one of the two apertures in the calamus of a feather.

5. (Science: geometry) One of foci of an ellipse, or other curve. 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.

Synonym: umbilic.

Origin: L. See Umbilic.

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The Fiber Disease

... forms. Foliose lichens have a leaf-like or lobed thallus, loosely attached to the substrate by root-like rhizines or by a central stalk-like umbilicus. Fruticose lichens have an intricately branched upright or pendulous thallus. Crustose lichens are low-growing, with the entire thallus firmly ...

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by London
Sat Dec 03, 2005 4:31 pm
Forum: Human Biology
Topic: The Fiber Disease
Replies: 7403
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... another 2 years pubic hair also grows from the near thighs in most young women, and sometimes a small amount up the line of the abdomen toward the umbilicus. In boys, the first pubic hair appears as a few sparse hairs on the scrotum or at the upper base of the penis (stage 2). Within a year, hairs ...

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by Dr.Stein
Mon Nov 28, 2005 2:35 am
Forum: Human Biology
Topic: Pubes
Replies: 14
Views: 24646

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