(1):

(v. i.) To become antiquated, rigid, or fixed, beyond the influence of change or progress.

(2):

(v. i.) To become fossil.

(3):

(v. t.) To convert into a fossil; to petrify; as, to fossilize bones or wood.

(4):

(v. t.) To cause to become antiquated, rigid, or fixed, as by fossilization; to mummify; to deaden.