Akademik

Pound
A measure of weight equal to 16 ounces or, metrically, 453.6 grams. The word "pound" goes back to the Latin "pondo" which meant a "weight" (but one of only 12 ounces). The abbreviation for pound—just to confuse non-pound people—is lb. which stands for "libra" (Latin for pound).
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A unit of weight, containing 12 ounces, apothecaries' weight, or 16 ounces, avoirdupois. [A.S. pund; L. pondus, weight]

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pound 'pau̇nd n, pl pounds also pound any of various units of mass and weight: as
a) a unit of troy weight equal to 12 troy ounces or 5760 grains or 0.3732417216 kilogram formerly used in weighing gold, silver, and a few other costly materials called also troy pound
b) a unit of avoirdupois weight equal to 16 avoirdupois ounces or 7000 grains or 0.45359237 kilogram called also avoirdupois pound

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(lb) (pound) [L. pondus weight; libra pound] a unit of mass (weight) of both the avoirdupois and the apothecaries' system. The avoirdupois pound contains 16 ounces, or 7000 grains, and is the equivalent of 453.592 gm. The apothecaries' pound contains 12 ounces, or 5760 grains, and is the equivalent of 373.242 gm.

Medical dictionary. 2011.