noun
Refers to a girl attending school, typically elementary through high school. Less common than 女子生徒 (じょしせいと) in modern usage, but still understood.
その女生は毎朝早く登校する。
That schoolgirl goes to school early every morning.
Compound of 女 (じょ, 'female') and 生 (せい, 'student'). The exact historical derivation is uncertain, but it follows a common pattern of Sino-Japanese abbreviations.