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rhythm method, n.
freq. cnt. 1
more info 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)
<noun.act>   freq. cnt.: 2 freq. cnt.: 1 freq. cnt.: 1

calendar method calendar method of birth control rhythm rhythm method rhythm method of birth control
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hypernym