umbilication


From The Collaborative International Dictionary of English v.0.48:

Umbilication \Um*bil"i*ca"tion\, n.
   A slight, navel-like depression, or dimpling, of the center
   of a rounded body; as, the umbilication of a smallpox
   vesicle; also, the condition of being umbilicated.
   [1913 Webster]
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