AVOIRDUPOIS
fatness, fat, blubber, avoirdupois
(noun) excess bodily weight; “she disliked fatness in herself as well as in others”
avoirdupois, avoirdupois weight
(noun) a system of weights based on the 16-ounce pound (or 7,000 grains)
Source: WordNet® 3.1
Etymology
Noun
avoirdupois (uncountable)
(historical) The official system of weights used in the UK between 1856 and 1963. It had been the customary system in London since 1300.
(historical) The official system of weights used in the USA between 1866 and 1959.
Weight; heaviness (commonly with humorous intent).
Source: Wiktionary
Av`oir*du*pois", n. & a. Etym: [OE. aver de peis, goods of weight,
where peis is fr. OF. peis weight, F. poids, L. pensum. See Aver, n.,
and Poise, n.]
1. Goods sold by weight. [Obs.]
2. Avoirdupois weight.
3. Weight; heaviness; as, a woman of much avoirdupois. [Colloq.]
Avoirdupois weight, a system of weights by which coarser commodities
are weighed, such as hay, grain, butter, sugar, tea.
Note: The standard Avoirdupois pound of the United States is
equivalent to the weight of 27.7015 cubic inches of distilled water
at 62º Fahrenheit, the barometer being at 30 inches, and the water
weighed in the air with brass weights. In this system of weights 16
drams make 1 ounce, 16 ounces 1 pound, 25 pounds 1 quarter, 4
quarters 1 hundred weight, and 20 hundred weight 1 ton. The above
pound contains 7,000 grains, or 453.54 grams, so that 1 pound
avoirdupois is equivalent to 1 31-144 pounds troy. (See Troy weight.)
Formerly, a hundred weight was reckoned at 112 pounds, the ton being
2,240 pounds (sometimes called a long ton).
Source: Webster’s Unabridged Dictionary 1913 Edition