Ossify

['ɒsɪfaɪ] or ['ɑsɪfaɪ]

(verb.) become bony; 'The tissue ossified'.

(verb.) cause to become hard and bony; 'The disease ossified the tissue'.

Typist: Toni--From WordNet

(v. t.) To form into bone; to change from a soft animal substance into bone, as by the deposition of lime salts.

(v. t.) Fig.: To harden; as, to ossify the heart.

(v. i.) To become bone; to change from a soft tissue to a hard bony tissue.

Typist: Maura