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Definitions from Wiktionary ()
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▸ noun: (botany) hilum
▸ noun: (zoology) A depression or opening in the center of the base of many spiral shells.
▸ noun: (zoology) Either of the two apertures in the calamus of a feather.
▸ noun: (space science) A tube connecting an astronaut or spacecraft to the mothership, through which supplies and samples can be transferred.
▸ noun: (geometry, obsolete) One of the foci of an ellipse or other curve.
▸ noun: (geometry) A point of a surface at which the curvatures of the normal sections are all equal to each other.
▸ noun: (historical) An ornamented or painted ball or boss fastened at each end of the stick on which manuscripts were rolled.
Similar:
navel,
bellybutton,
omphalos,
omphalus,
umbilic,
umbi,
umbilication,
umbilicoplasty,
acromphalus,
abdominal,
more...
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▸ Words similar to umbilicus
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