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From Biology-Online Dictionary
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1. To convert into a fossil; to petrify; as, to fossilize bones or wood.

2. To cause to become antiquated, rigid, or fixed, as by fossilization; to mummify; to deaden. Ten layers of birthdays on a woman's head Are apt to fossilize her girlish mirth. (Mrs. Browning)

Origin: cf. F. Fossiliser.

1. To become fossil.

2. To become antiquated, rigid, or fixed, beyond the influence of change or progress.