Promontory
Promontorium
Definition
The promontory of sacrum is the anterior margin of the body of first sacral vertebra, forming the prominent sacrovertebral angle when articulated with the last lumbar vertebra.
References
This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/).