os·si·fy

[os-uh-fahy] verb, os·si·fied, os·si·fy·ing.
verb (used with object)
1.
to convert into or cause to harden like bone.
verb (used without object)
2.
to become bone or harden like bone.
3.
to become rigid or inflexible in habits, attitudes, opinions, etc.: a young man who began to ossify right after college.

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

os·si·fi·er, noun
un·os·si·fy·ing, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
ossify (ˈɒsɪˌfaɪ) [Click for IPA pronunciation guide]
 
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]
 
'ossifier
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Ossify is a GRE word you need to know.
So is malapropism. Does it mean:
having or showing a disposition to obtrude, as by imposing oneself or one's opinions on others
A wonderful form of word play in which one word is mistakenly substituted for another that sounds similar.
Etymonline
Word Origin & History

ossify
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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