safe period

noun

1. 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.

safe period

noun

1. informal.
   the period during the menstrual cycle when conception is considered least likely to occur See also rhythm method

Word History and Origins

Origin of safe period¹

First recorded in 1915–20

Example Sentences

After monitoring Jackson for a safe period, Murray said, he left the room for “just two minutes” to go to the bathroom.

From The Daily Beast

The age of Richelieu was not a very safe period for any one who had unhappily excited the displeasure of powerful foes.

From Project Gutenberg