1. The natural process of bone formation.
a. The hardening or calcification of soft tissue into a bonelike material.
b. A mass or deposit of such material.
a. The process of becoming set in a rigidly conventional pattern, as of behavior, habits, or beliefs.
b. Rigid, unimaginative convention.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.