the ossification of cartilage that begins under the perichondrium and proceeds inward.
Origin of ectostosis
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Ossification in cartilage beneath the perichondrium.
The formation of bone beneath the periosteum.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.