Tutor

n. [Lat. tutor, from tueri, to watch, defend; It. tutore, Sp., Pg., & Pr. tutor, Fr. tuteur.] One who guards, protects, watches over, or has the care of, another; hence, specifically, (a.) (Civ. Law.) One who has the charge of a child or pupil and his estate; a guardian. (b.) A private or public teacher. (c.) (Eng. Universities and Colleges.) An officer or member of some hall, who has the charge of hearing the lessons of the students, and otherwise giving them instruction in the sciences and various branches of learning. (d.) (Am. Colleges.) An instructor of a lower rank than a professor.