also: おぎのしき
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.
The Ogino method is a way to predict the ovulation day by measuring basal body temperature.
The Ogino method was commonly used in the past, but now there are more reliable contraceptive methods.
避妊 is the general term for contraception; オギノ式 is one specific historical method.
Standard katakana spelling for the Ogino method; widely recognized in medical and everyday contexts.
Kanji spelling using the inventor's surname 荻野; less common than the katakana form but still encountered.
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).