Imperial unit (symbol lb) of mass equal to 16 ounces (7,000 grains) avoirdupois, or 12 ounces (5,760 grains) troy; the metric equivalents are 0.45 kg and 0.37 kg respectively. It derives from the Roman libra, which weighed 0.327 kg.
1. 16 ounces; SYN. lb.
2. A nontechnical unit of force equal to the mass of 1 pound with an acceleration of free fall equal to 32 feet/sec/sec; SYN. lbf.
3. A public enclosure for stray or unlicensed dogs; SYN. dog pound.