Umbilication 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.

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Taxonomy
depression, Dictionary, Houghton Mifflin Company, Vocabulary, Pronunciation, navel, The American, American Heritage, Medical Dictionary, word origin, free online English dictionary, dictionary results, Random House Dictionary, Dictionary of the English Language, free online dictionary, definitions, websters, spelling.

Defination from the web:
Umbilication - Definition of Umbilication at Dictionary.com a free online dictionary with pronunciation, synonyms, and translation of Umbilication. ... a depression resembling a navelumbilication in the center of a lesion>; also : the state or condition of having such depressions umbilication> ...