fossilize Syllabification: (fos·sil·ize)Pronunciation: /ˈfäsəˌlīz/Definition of fossilize verb [with object] (usually be fossilized) preserve (an organism) so that it becomes a fossil:the hard parts of the body are readily fossilized [no object] become a fossil:flowers do not readily fossilize become or cause to become antiquated, fixed, or incapable of change or development. Derivatives fossilizationPronunciation: /ˌfäsəliˈzāSHən/ noun fossilize in other Oxford dictionaries Definition of fossilize in the British & World English dictionary