safe-period

safe period

noun
an interval of the menstrual cycle when fertilization is considered to be least likely, usually a number of days prior and subsequent to the onset of menstruation.

Origin:
1915–20

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Collins
World English Dictionary
safe period
 
n
informal See also rhythm method the period during the menstrual cycle when conception is considered least likely to occur

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

safe period n.
The period in the menstrual cycle when conception is least likely, typically from ten days before to ten days after the onset of menstruation.

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