quarrel (subs. O. E. Copy link Outline I. A small square or lozenge-shaped pane of glassII. A square-headed arrow or cross-bow bolt • quarrel (subs. O. E. fr. Fr. quadreau, Ital. quadrella; called fr. its square form; origin distinct fr. foll. word): I. A small square or lozenge-shaped pane of glass: expr. by tessella, f. (prop. a small square of stone, Juv. 11, 132: Sen. Q. N. 6, 31), or rhombus, m. (the math. fig., Front. Expos. form. p. 36, Goes., with vitri or vitrea [-us]): a q.'d casement, *fenestra tessellata. II. A square-headed arrow or cross-bow bolt: *spīcŭlum quadratum: v. arrow.