PYROXENE n.
A common mineral occurring in monoclinic crystals, with a prismatic angle of nearly 90º, and also in massive forms which are often laminated. It varies in color from white to dark green and black, and includes many varieties differing in color and composition, as diopside, malacolite, salite, coccolite, augite, etc. Th…
QUADRILATERAL n.
rea defended by four fortresses supporting each other; as, the Venetian quadrilateral, comprising Mantua, Peschiera, Verona, and Legnano. Complete quadrilateral (Geom.), the figure made up of the six straight lines that can be drawn through four points, A., B, C, I, the lines being supposed to be produced indefinitely.…
QUARTER n.
fourth of the crew) on a man-of- war. -- To give, or show, quarter (Mil.), to accept as prisoner, on submission in battle; to forbear to kill, as a vanquished enemy. -- To keep quarter. See Quarter, n., 3.