1647. Fletcher, Fair Maid of the Inn, v. 2. He ... may now travel to Rome with a MORTAR on’s head.

1857. Cuthbert Bede, Verdant Green, pt. II. ch. iii. “I don’t mind this ’ere MORTAR-BOARD, sir,” remarked the professor of the noble art of self-defence, as he pointed to the academical cap which surmounted his head.

1864. Fun, 21st May, p. 96. Anon I saw a gentle youth (no “sub fusc” undergrad.). “Toga virilis” he had none, no MORTAR-BOARD he had.

1881. Pascoe, Every-day Life, 147. On admission ... a boy provides himself with a MORTAR or college-cap.

1898. Stonyhurst Mag., Dec., p. 149, “Life at Oxford.” The wearing of a cap and gown is another novelty for freshmen. At first one is apt to feel very foolish under a “MORTAR-BOARD” and in the folds of the academic gown, particularly in the miserable garb assigned to commoners (i.e. undergraduates without scholarships).

Mouse-digger, subs. (Winchester).—See quot.

c. 1840. Mansfield, School-Life, 150. Plying the MOUSE-DIGGER (a kind of diminutive pick-axe) in search of mice.

Mud-student, subs. (general).—A student at the Agricultural College, Cirencester.

1856. Notes and Queries, 2 S., ii. 198. A young friend of mine ... a MUD-STUDENT.

Muff, verb (Eton).—To fail in an examination; TO BE SPUN (q.v.) or PLUCKED (q.v.); TO SKIP A COG (q.v.).