noun, noun which may take the genitive case particle 'no'
full boarding system; residential system
Refers to an educational system where all students live in dormitories, as in a boarding school. Often used with の to modify nouns (e.g., 全寮制の学校).
この学校は全寮制で、生徒はみんな寮に住んでいる。
This school is a full boarding system, and all students live in the dormitory.
全寮制の高
I entered a boarding high school.
寄宿舎 is a boarding house or dormitory, often used in a broader sense than school dormitories. 全寮制 specifically refers to the educational system.
Compound of 全 (all), 寮 (dormitory), and 制 (system). The exact historical derivation is uncertain, but the word transparently means 'all-dormitory system'.