noun
female high school student
Standard term for a girl attending high school (grades 10–12). Often abbreviated as JK in slang.
彼女は女子高生です。
She is a female high school student.
駅で女子高生のグループを見かけた。
I saw a group of female high school students at the station.
Compound of 女子 (female) + 高 (high, abbreviation of 高等学校) + 生 (student). A straightforward modern coinage.