conjoined twins united by the vertebrae.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
spondylodymus(spŏn″dĭ-lŏd′ĭ-mŭs) [″ + didymos, twin]
Twin fetuses joined at the vertebrae.
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