[ ʌm'bɪlɪkəs , ˌʌmbɪ'lʌɪkəs ]
■ noun ( plural umbilici -sʌɪ or ~es )
1》 Anatomy the navel.
2》 Zoology a central depression or hole in the whorl of some gastropod molluscs and many ammonites.
3》 Zoology a hole at each end of the hollow shaft of a feather.
Origin
C17: from L.: related to Gk omphalos , also to navel .