also: おぎのしき
noun
Ogino method; rhythm method
A calendar-based birth control method developed by Kyusaku Ogino. In modern Japanese, it is often referred to as オギノ式避妊法 or simply オギノ式.
オギノ式は、基礎体温を測って排卵日を予測する方法です。
The Ogino method is a way to predict the ovulation day by measuring basal body temperature.
昔はオギノ式がよく使われていた
The Ogino method was commonly used in the past, but now there are more reliable contraceptive methods.
Named after Japanese gynecologist Kyusaku Ogino (荻野久作), who developed the rhythm method in the 1920s. The term combines his surname with 式 (method/style).