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.

noun

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

n.

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