quad
noun [ C ] uk/kwɒd/ us/kwɑːd/
(PERSON)
四胞胎之一（quadruplet的非正式说法）
informal for quadruplet
(SQUARE)
(formal quadrangle)（尤指中小学或大学中周围有建筑物的）四方院，四方场地
a square space outside with buildings on all four sides, especially in a school or college