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ossify (v.)

1713, intransitive, "to harden like bone, become bone;" 1721, intransitive, "convert to bone;" a back-formation from ossification, or else modeled on French ossifier (18c.) and formed from Latin os (genitive ossis) "bone" (from PIE root *ost- "bone") + -fy. Figurative sense "become rigid and fixed" (of thought, customs, etc.) is by 1858. Related: Ossified; ossifying.

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Definitions of ossify from WordNet

ossify (v.)
become bony;
The tissue ossified
ossify (v.)
make rigid and set into a conventional pattern;
ossified teaching methods
Synonyms: rigidify / petrify
ossify (v.)
cause to become hard and bony;
The disease ossified the tissue
From wordnet.princeton.edu