従姉妹
いとこ · itoko · JLPT N3 · noun
cousin
👭 従姉妹 = secondary (従) + sisters (姉妹): sisters one step removed
従 marks a relative one step removed from your own line. Add 姉妹 (older and younger sister) and you get female cousins. The male version is 従兄弟 (older and younger brother), read the same way: itoko.