UMBILICUS

navel, umbilicus, bellybutton, belly button, omphalos, omphalus

(noun) 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”

Source: WordNet® 3.1

Etymology

Noun

umbilicus (plural umbilici or umbilicuses)

(anatomy) navel

(botany) hilum

(zoology) A depression or opening in the center of the base of many spiral shells.

(zoology) Either of the two apertures in the calamus of a feather.

(space) A tube connecting an astronaut or spacecraft to the mothership, through which supplies and samples can be transferred.

(geometry, obsolete) One of the foci of an ellipse or other curve.

(geometry) A point of a surface at which the curvatures of the normal sections are all equal to each other.

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

Synonyms

• (navel): omphalos

• (navel): omphalus

Source: Wiktionary

Um`bi*li"cus, n. Etym: [L. See Umbilic.]

1. (Anat.)

Definition: 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.

2. (Gr. & Rom. Antiq.)

Definition: An ornamented or painted ball or boss fastened at each end of the stick on which manuscripts were rolled. Dr. W. Smith.

3. (Bot.)

Definition: The hilum.

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

5. (Geom.) (a) One of foci of an ellipse, or other curve. [Obs.] (b) 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.

Source: Webster’s Unabridged Dictionary 1913 Edition