definition of quarrel
quarrel (plural quarrels) 1  A diamond-shaped piece of coloured glass forming part of a stained glass window. 2  A square tile; quarry tile. 3  A square-headed arrow for a crossbow. 4  A small opening in window tracery, of which the cusps etc. make the form nearly square. 5  A four-sided cutting tool or chisel with a diamond-shaped end.