Definition:Avoirdupois/Pound

Definition
The ounce is an avoirdupois unit of mass.
 * $1$ pound avoirdupois $= 16$ ounces avoirdupois $= 7 \, 000$ grains $\approx 453 \cdotp 59237$ grams.

The gram equivalent is defined to be exact.

Also see

 * Definition:Pound
 * Definition:Apothecaries' Pound
 * Definition:Troy Pound