John Buchan
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The skeletons of mammals originate as soft cartilage that gradually transforms into hard bone; in humans, the process begins in the womb and continues until late adolescence. This bone-building process was given the name ossification in the late 17th century, with the verb ossify following soon after. The words come from the Latin root os, meaning "bone." (Os is also a synonym of bone in scientific contexts.) Both terms have come to refer to figurative types of hardening, such as that of the heart or mind.
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What is the difference between ossify and calcify?
Medically speaking, ossify refers to the process by which bone forms, or by which tissue (usually cartilage) changes into bone. Ossification is a natural process that starts in utero and which comprises several different steps—one of which is the deposit of calcium salts, also known as calcification. Calcify, however, only refers to the deposit of calcium salts in soft tissue and is not synonymous with ossify. Ossification creates bone tissue, which is more than simply a deposit of calcium salts.
Both ossify and calcify have gained more general uses as well. Calcify refers to hardening, to becoming inflexible and unable to change:
What were once upstart revisionist currents calcified into self-regarding academic sub-specialties, sponsoring plenty of analysis but little fundamental debate.
— Sean Wilentz, The New Republic, 2 July 2001
Ossify refers to becoming inflexible, conventional, and resistant to change:
For these writers, the ossified ideologies of the world, imbedded in the communal imagination, block vision, and as artists they respond not by criticism from without but by confrontation from within.
—Robert Coover, The New York Times Book Review, 18 Mar. 1984
While ossify generally has a slightly more disparaging connotation to it than calcify does in general uses, our evidence shows that the two words are beginning to merge semantically.
Examples of ossify in a Sentence
Dan Piepenbring, Harper's Magazine, 23 Sep. 2024
Once the answers become ossified, the questions become rhetorical, and the education ceases to cultivate the child’s capacities.
—Ray Ravaglia, Forbes, 1 Oct. 2024
Brought up by unfriendly, ossifying nuns, ancient retainers, and countless skeletons, Gideon is ready to abandon a life of servitude and an afterlife as a reanimated corpse.
—Brianne Kane, Scientific American, 27 Sep. 2024
But the only time the new movie feels like its joints haven’t ossified is in a few scenes with L.A. oddballs like Nasim Pedrad’s ditzy real estate agent or Affion Crockett as a country club valet who’s not falling for Axel’s shtick.
—Ty Burr, Washington Post, 3 July 2024
See all Example Sentences for ossify 
Dictionary Entries Near ossify
Cite this Entry
“Ossify.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ossify. Accessed 18 Dec. 2024.
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ossify
verb
Medical Definition
ossify
verb
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