Webster's English Dictionary

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umbilicus

um.bi.li.cus \.*m-'bil-i-k*s, .*m-b*-'li--\ \-'bil-*-.ki-, -.ke-, -.si-; 
   -'li--.ki-, -.si-\ n or um.bi.li.ci or um.bi.li.cus.es [L - more at NAVEL] 
   pl  1a: a small depression in the abdominal wall at the point of attachment 
   of  the umbilical cord to the embryo 1b: any of several morphological 
   depressions; esp : HILUM  2: a central point : CORE, HEART