Quar″rel (?), n. [OE. quarel, OF. quarrel, F. carreau, LL. quadrellus, from L. quadrus square. See Quadrate, and cf. Quadrel, Quarry an arrow, Carrel.] 1. An arrow for a crossbow; — so named because it commonly had a square head.
To shoot with arrows and quarrel. Sir J. Mandeville.
Two arblasts,... with windlaces and quarrels. Sir W. Scott.
2. (Arch.) Any small square or quadrangular member; as: (a) A square of glass, esp. when set diagonally. (b) A small opening in window tracery, of which the cusps, etc., make the form nearly square. (c) A square or lozenge-shaped paving tile.
3. A glazier's diamond. Simmonds.
4. A four-sided cutting tool or chisel having a diamond-shaped end.