Tu″tor (?), n. [OE. tutour, L. tutor, fr. tueri to watch, defend: cf. F. tuteur. Cf. Tuition.] One who guards, protects, watches over, or has the care of, some person or thing. Specifically: —
(a) A treasurer; a keeper. “Tutour of your treasure.” Piers Plowman.
(b) (Civ. Law) One who has the charge of a child or pupil and his estate; a guardian.
(c) A private or public teacher.
(d) (Eng. Universities) An officer or member of some hall, who instructs students, and is responsible for their discipline.
(e) (Am. Colleges) An instructor of a lower rank than a professor.