D / doctrix
noun

doctrix

gen. doctrīcis · gender feminine · decl. 3rd
she who instructs; an instructress; teacher
she who instructs, an instructress, teacher: (sapientia) doctrix est disciplinae Dei, Vulg. Sap. 8, 4; August. de Mor. Eccl. Cath. 16; Serv. Verg. A. 12, 159; Prisc. 1122 P.