calendar method of birth control

Noun
  1. Natural family planning in which ovulation is assumed to occur 14 days before the onset of a period (the fertile period would be assumed to extend from day 10 through day 18 of her cycle) (synset 100854775)
    is a type of: natural family planning - any of several methods of family planning that do not involve sterilization or contraceptive devices or drugs; coitus is avoided during the fertile time of a woman's menstrual cycle
    same as: calendar method, rhythm, rhythm method, rhythm method of birth control

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