Avoirdupois is a system of measuring weight based on the fact that sixteen ounces are in a pound. The metric system is based on grams, and the avoirdupois system is based on pounds.

This odd-looking term means something very common, at least if you live in England or the United States: the avoirdupois system is a standard for measuring weight based on there being sixteen ounces in a pound. If you measure your weight in pounds, you're using the avoirdupois system. If you measure liquids in ounces, you're using the avoirdupois system. This is one of many standards of measurement that exist, such as the metric system, which is based on units of 10.

Definitions of avoirdupois
  1. noun
    a system of weights based on the 16-ounce pound (or 7,000 grains)
    synonyms: avoirdupois weight
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    type of:
    system of weights, weight
    a system of units used to express the weight of something
  2. noun
    excess bodily weight
    synonyms: blubber, fat, fatness
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    leanness, spareness, thinness
    the property of having little body fat
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    adiposeness, adiposity, fattiness
    having the property of containing fat
    abdominousness, paunchiness
    the bodily property of a protruding belly
    greasiness, oiliness, oleaginousness
    consisting of or covered with oil
    corpulency, fleshiness, obesity
    more than average fatness
    an extreme accumulation of fat on the buttocks
    adiposis, corpulence, overweight, stoutness
    the property of excessive fatness
    exogenous obesity
    obesity caused by overeating
    embonpoint, plumpness, roundness
    the bodily property of being well rounded
    type of:
    bodily property
    an attribute of the body
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