verb (used with object), ossified, ossifying.
to convert into or cause to harden like bone.
verb (used without object), ossified, ossifying.
to become bone or harden like bone.
to become rigid or inflexible in habits, attitudes, opinions, etc.: a young man who began to ossify right after college.

1705–15; < Latin ossi- (stem of os) bone + -fy

ossifier, noun
unossifying, adjective
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World English Dictionary
ossify (ˈɒsɪˌfaɪ)
vb , -fies, -fying, -fied
1.  to convert or be converted into bone
2.  (intr) (of habits, attitudes, etc) to become inflexible
[C18: from French ossifier, from Latin os bone + facere to make]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1713, "to turn into bone," from L. os (gen. ossis) "bone" (see osseous). Fig. sense is from 1858.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

ossify os·si·fy (ŏs'ə-fī')
v. os·si·fied, os·si·fy·ing, os·si·fies
To change into bone.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Each of the lateral parts begins to ossify from a single center during the eighth week of fetal life.
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