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pregnanediol

[ prĕg′nān-dīôl ]
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n.
A steroid metabolite of progesterone that is biologically inactive; a form of the compound occurs in the urine of pregnant women.
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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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