necrobiosis Syllabification: (nec·ro·bi·o·sis)Pronunciation: /ˌnekrōbīˈōsis/Definition of necrobiosis noun Medicine gradual degeneration and death of cells in the body tissues. Derivatives necrobioticPronunciation: /-ˌbīˈätik/ adjective necrobiosis in other Oxford dictionaries Definition of necrobiosis in the British & World English dictionary