ossify

Pronunciation: /ˈɒs.ɪ.faɪ/

The English word “ossify” has 4 meanings listed here.

verb

To transform (or cause to transform) from a softer animal substance into bone; particularly the processes of growth in humans and animals.
To become (or cause to become) inflexible and rigid in habits or opinions.
To grow (or cause to grow) formulaic and permanent.
To calcify.

Back-formation from ossification, or modeled on French ossifier and formed from Latin os, ossis (“bone”) + -ify.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.