tribrachia
Medical Dictionary

tribrachia tri·bra·chi·a (trī-brā'kē-ə)
n.
A condition seen in conjoined twins when the fusion has merged the adjacent arms to form a single one, so that there are only three arms for the two bodies.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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