umbilicus

About 0.63 uses per million words.

Meaning

1. noun A navel.
2. noun A umbilical cord.
3. noun A hilum.
4. noun A depression or opening in the center of the base of many spiral shells.
5. noun Either of the two apertures in the calamus of a feather.
6. noun A tube connecting an astronaut or spacecraft to the mothership, through which supplies and samples can be transferred.
7. noun One of the foci of an ellipse or other curve.
8. noun 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.

Similar words

bellybutton navel omphalus omphalos cotyledon umbilic umbi umbilication umbilicoplasty acromphalus

Often followed by

and is to or in of with may was

Word family

umbilici umbilicuses