[1] : The Collaborative International Dictionary of English v.0.48

umbilicate \umbil"icate\, umbilicated \umbil"ica`ted\, a.
   l. umbilicatus. see umbilic.
      a depressed in the middle, like a navel, as a flower,
          fruit, or leaf; navel-shaped; having an umbilicus; as,
          an umbilicated smallpox vesicle.
      b bot. supported by a stalk at the central point.
          1913 webster
see also:
umbilic 

[2] : WordNet (r) 2.0

umbilicate
     adj : depressed like a naval

Umbilicate >> U Words
Umbilicate, definition of term: Umbilicate
umbilicate_pag1.html