os ‧ si ‧ fy /ˈɒsəfaɪ, ˈɒsɪfaɪ $ ˈɑː-/ BrE AmE verb ( past tense and past participle ossified , present participle ossifying , third person singular ossifies )
[ Date: 1700-1800 ; Language: French ; Origin: ossifier , from Latin os 'bone' ]
1 . [intransitive] formal to become unwilling to consider new ideas or change your behaviour
2 . [intransitive and transitive] technical to change into bone or to make something change into bone
—ossification /ˌɒsəfəˈkeɪʃ ə n, ˌɒsɪfəˈkeɪʃ ə n $ ˌɑːs-/ noun [uncountable]