pelvospondylitis ossificans
(spŏn′dl-ī′tĭs ŏ-sĭf′ĭ-kănz′)- Deposit of bony substance between the vertebrae of the sacrum.
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The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.