copula

详细解释:n. 系词, 介体, 接合部
【医】 介体; (舌)联桁; 交配

词型变化：

形容词:copular

英语解释：

名词 copula:

an equating verb (such as `be' or `become') that links the subject with the complement of a sentence同义词：copulative, linking verb