American Dictionary of the English Language

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OS'SIFY, verb transitive [Latin os, bone, anf facio, to form.]

To form bone; to change from a soft animal substance into bone, or convert into a substance of the hardness of bones. This is done by the deposition of calcarious phosphate or carbonate on the part.

OS'SIFY, verb intransitive To become bone; to change from soft matter into a substance of bony hardness.