• An arrow for a crossbow; -- so named because it commonly had a square head. • Any small square or quadrangular member • A square of glass, esp. when set diagonally. • A small opening in window tracery, of which the cusps, etc., make the form nearly square. • A square or lozenge-shaped paving tile. • A glazier's diamond. • A four-sided cutting tool or chisel having a diamond-shaped end. • A breach of concord, amity, or obligation; a falling out; a difference; a disagreement; an antagonism in opinion, feeling, or conduct; esp., an angry dispute, contest, or strife; a brawl; an altercation; as, he had a quarrel with his father about expenses. • Ground of objection, dislike, difference, or hostility; cause of dispute or contest; occasion of altercation. • Earnest desire or longing. • To violate concord or agreement; to have a difference; to fall out; to be or become antagonistic. • To dispute angrily, or violently; to wrangle; to scold; to altercate; to contend; to fight. • To find fault; to cavil; as, to quarrel with one's lot. • To quarrel with. • To compel by a quarrel; as, to quarrel a man out of his estate or rights. • One who quarrels or wrangles; one who is quarrelsome.