ossify
[verb]
Synonyms: harden, fossilize, solidify, stiffen

[TahlilGaran] English Synonym Dictionary ▲

os‧si‧fy /ˈɒsəfaɪ, ˈɒsɪfaɪ $ ˈɑː-/ 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 /ˌɒsəfəˈkeɪʃən, ˌɒsɪfəˈkeɪʃən $ ˌɑːs-/ noun [uncountable]

[TahlilGaran] Dictionary of Contemporary English ▲