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nägele's rule in Medicine

Nägele's rule

n.
  1. A rule used as a means of estimating date of delivery by counting back three months from the first day of the last menstrual period and adding seven days.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.