umbilicus

plural umbilici · plural umbilicuses

1. anatomyA navel.

   Synonyms: omphalos, omphalus

2. broadlyproscribedsometimesA umbilical cord.

   Then he tied the umbilicus in two places, using bits of Manila twine, and made his cut between them.

   2000 May 8, David Guterson, East of the Mountains, A&C Black, →ISBN, page 263

   2 more examples

   Although I have been tempted to cut the umbilicus, and pass a ligature round the remaining portion on one occasion, yet I now deem such interference officious and uncalled - for at this eventful period.

   1834, Sporting Magazine, page 179

   She ate the umbilicus, and the afterbirth, which is supposed to be good for them. Then she licked off the first kitten and was ready for the next.

   1980, Morty Sklar, Jim Mulac, Editor's Choice: Literature & Graphics from the U.S. Small Press, 1965-1977 : Poetry, Fiction, Essays, Graphics : Selected from Nominations by Editors of Independent, Non-commercial Presses & Magazines

3. biologyA hilum.
4. biologyA depression or opening in the center of the base of many spiral shells.
5. biologyEither of the two apertures in the calamus of a feather.
6. spaceA tube connecting an astronaut or spacecraft to the mothership, through which supplies and samples can be transferred.

   Penetrators will be connected by an umbilicus to an afterbody containing imaging and meteorological instruments.

   1977, James W. Head, United States. National Aeronautics, Space Administration, Significant achievements in the planetary geology program, 1975-1976

   3 more examples

   The importance of the visual analyzer is further increased when the cosmonaut is in free space with only the slight support of an umbilicus.

   1966, Aerospace Technology Division, Soviet Biotechnology and Bioastronautics: Report, Library of Congress, page 10

   How about a 270 mile tether to an orbiting satellite? Oh, you'd like that, wouldn't you? Frank! Prepare to receive the umbilicus!

   1994, Michael J. Nelson (head writer), "Girls Town", episode 601, Mystery Science Theater 3000

   Ninety minutes into the twenty-six hour flight, Leonov opened the outer hatch and pushed himself out to the end of his 17-foot umbilicus — becoming the first man to walk in space.

   2013, Treion Muller, Matthew Murdoch, The Webinar Manifesto: Never Design, Deliver, or Sell Lousy Webinars Again!, RosettaBooks, →ISBN

7. obsoletegeometryOne of the foci of an ellipse or other curve.
8. geometryA 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.

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

   The ends of the umbilicus were called cornua (i.e. horns) in Latin, and were usually adorned with some pretty device

   1763, William Massey, The Origin and Progress of Letters