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atrioseptostomy

[ ā′trē-ō-sĕp-tŏstə-mē ]
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n.
The surgical establishment of a communication between the atria of the heart.
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Which of the following nouns has an irregular plural form?
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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