実じつ妹まいじつまいFreq.FrequencyTop 50,000じ字FuriganaMeanings1nounbiological younger sisterUsed to specify a younger sister by blood, as opposed to a sister-in-law, stepsister, or close friend called 妹.彼かの女じょは私わたしの実じつ妹まいです。She is my biological younger sister.
