Boarding Student
Boarder
noun
A dormitory student (comes from 学生) is a boarding student or a boarder. This is a student who lives in a dormitory.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
「新しい寮生はセクシー？」「ああ、セクシーだよ。フグなんて、すでに彼女に熱を上げているよ。」
"Is the new boarding student sexy?" "Yup, she is. Fugu’s got the hots for her already."