1. A unit of mass in use in the United States, equal to ¹/₄ short ton, or 500 pounds, or 226.796185 kilograms.

2. A unit of mass used in troy measure, equal to ¹/₄ troy hundredweight, or 25 troy pounds, or 9.33104304 kilograms. Abbreviated qr tr.

3. A unit of mass used in the United Kingdom, equal to ¹/₄ hundredweight, or 28 pounds, or 12.70058636 kilograms. Abbreviated qr.

4. A unit of volume used in the United Kingdom for measurement of liquid and solid substances, equal to 8 bushels, or 64 gallons, or approximately 0.290950 cubic meter.

Portions of a vessel's sides about midway between the stem and the middle and between the middle and the stern.