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Avoirdupois
The avoirdupois system (; (:avwaʁdypwɑ); abbreviated avdp) is a system of weights (more properly, mass) based on a pound of 16 ounces. It is the everyday system of weight used in the United States and is still used to varying degrees in everyday life in the United Kingdom, Canada, the Republic of Ireland, and some other former British colonies despite the official adoption of the metric system. An alternative system of mass, the troy system, is generally used for precious materials. The modern definition of the avoirdupois pound is exactly kilograms.
== Etymology ==
is from Anglo-Norman French (later ''avoir de pois''), literally "goods of weight" (Old French , "property, goods", also "to have", comes from the Latin ラテン語:''habere'', "to have, to hold, to possess property"; = "from"/"of", cf. Latin; = "weight", from Latin ラテン語:''pensum''). This term originally referred to a class of merchandise: , "goods of weight", things that were sold in bulk and were weighed on large steelyards or balances. Only later did it become identified with a particular system of units used to weigh such merchandise. The orthography of the day has left many variants of the term, such as and . (The Norman became the Parisian . In the 17th century ''de'' was replaced with ''du''.)〔("avoirdupois, n.". OED Online. ) Oxford University Press.(accessed March 27, 2012)〕
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