[ prĕg′nān-dī′ōn ]
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An unsoluble metabolite of progesterone formed in relatively small quantities and occurring in either of two isomeric configurations: alpha or beta.
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Test how much you really know about regular and irregular plural nouns with this quiz.
Question 1 of 9
Which of the following nouns has an irregular plural form?
Words nearby pregnanedione
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.