Wiktionary
n. A method of natural birth control that involves counting days of a woman's menstrual cycle in order to determine when sexual intercourse is most or least likely to result in pregnancy.
WordNet
n. 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) [syn: rhythm method of birth control, rhythm, calendar method of birth control, calendar method]
Usage examples of "rhythm method".
As to this abstention during certain times of the month, well, in my country it's called the rhythm method, and the Pope has approved it.
The rhythm method or Vatican roulette as it is called by hip Catholics, is a waste unless you are ready to surround yourself with thermometers, graphs and charts.
Even with all these precautions, women have often gotten pregnant using the rhythm method.
Sir Conrad's ladies had long been using a method of preventing this taught them by Lady Richeza and known as the rhythm method.
As far as Mary's parents had been concerned, the rhythm method was the only acceptable form of birth control-Mary thought it was a miracle that she only had three siblings instead of a dozen.
There was nothing like the rhythm method for producing all descendants great and small, Paul thought, and donkeyed again.
She was expelled for writing to the Pope, explaining to him why the rhythm method of contraception, for a lot of girls, just didn't work.