American Heritage Dictionary
(5)
Century Dictionary
(5)
GNU Webster's 1913
(1)
WordNet
(4)
Elsewhere on the web
These are stages of metamorphosis of muscle tissue into bone tissue in mouse model of heterotopic ossification (misplaced bone growth).— PhysOrg.com - latest science and technology news stories
Sacral vertebrae are enclosed in a second stippled box where sacrals can be identified (e.g., by co-ossification).— PLoS ONE Alerts: New Articles
In a word, intellectual ossification, an osteoporosis of the imagination.— The Georgia Straight - News And Views
Physitis is a term that describes defects in the ossification (process of cartilage hardening into bone) of the growth plate (physis) at the end of a long bone.— TheHorse.com News
A defect in the endochondral ossification process at the joint surface causes displacement of an area of abnormal cartilage as a fragment or flap (this condition is termed osteochondritis dissecans), or as a cyst that remains just beneath the surface of the joint.— TheHorse.com News

Century Dictionary (1)
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You can expect to see this word a few times a year.
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