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1. To transform (or cause to transform) from a softer animal substance into bone; particularly the processes of growth in humans and animals. (

2. To change (as cartilage) into bone. (

3. To become (or cause to become) inflexible and rigid in habits or opinions. (

4. To grow (or cause to grow) formulaic and permanent. (

Word origin” Formed from Latin os (genitive ossis) “bone.”

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