1. Preparation of the natural crown of a tooth by removal of part or all of the natural structure and replacing the prepared surfaces with a veneer of suitable dental material (gold or nonprecious metal casting, porcelain, plastic, or combinations).
2. That stage of childbirth when the fetal head has negotiated the pelvic outlet and the largest diameter of the head is encircled by the vulvar ring.
The information shown above for crowning is provided by Stedman's.
* Stedman's, part of Lippincott Williams & Wilkins, provide a comprehensive line of health-science publications for healthcare professionals and medical students.