noun
elder stepsister
Refers to an older female step-sibling, specifically one who is older than the speaker. The term is not commonly used in modern Japanese; 義理の姉 (ぎりのあね) is more standard.
彼女は私の継姉です。
She is my elder stepsister.
継姉は去年結婚しました。
My elder stepsister got married last year.