A secondary school emphasizing Latin and Greek in preparation for college WordNet 3.0 & Open English WordNet

A grammar school is one of several different types of school in the history of education in the United Kingdom and other English-speaking countries, originally a school teaching Latin, but more recently an academically oriented secondary school. Wikipedia

Type of school in the United Kingdom and some other countries Wikidata

A school that teaches its pupils the grammar system of a European language, especially Latin and Greek. Wiktionary

School that teaches the grammar system of Latin or Greek. Wiktionary (translation)