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FOSSILISE - verb (used with object)
1. Geology. to convert into a fossil; replace organic with mineral substances in the remains of an organism.
2. to change as if into mere lifeless remains or traces of the past.
3. to make rigidly antiquated: Time has fossilized such methods.
–verb (used without object)
4. to become a fossil or fossillike: The plant fossilized in comparatively recent geologic time.
5. Linguistics. (of a linguistic form, feature, rule, etc.) to become permanently established in the interlanguage of a second-language learner in a form that is deviant from the target-language norm and
that continues to appear in performance regardless of further exposure to the target language.