21. (Mil.) (a) A row of men who are abreast of one another, whether
side by side or some distance apart; -- opposed to column. (b) The
regular infantry of an army, as distinguished from militia, guards,
volunteer corps, cavalry, artillery, etc.
22. (Fort.) (a) A trench or rampart. (b) pl. Dispositions made to cover
extended positions, and presenting a front in but one direction to an
enemy.
23. pl. (Shipbuilding) Form of a vessel as shown by the outlines of
vertical, horizontal, and oblique sections.
24. (Mus.) One of the straight horizontal and parallel prolonged
strokes on and between which the notes are placed.