The Collaborative International Dictionary
Endostosis
Endostosis \En`dos*to"sis\, n. [NL. See Endo-, and Ostosis.] (Physiol.) A process of bone formation in which ossification takes place within the substance of the cartilage.
Wiktionary
endostosis
n. (context physiology English) A process of bone formation in which ossification takes place within the substance of the cartilage.