apothecary weights
   a version of the troy weight system formerly used by apothecaries (pharmacists). The troy pound, equal to 373.242 grams or 13.165 72 avoirdupois ounces, is always divided into 12 ounces, each ounce being equal to 480 grains. In the apothecary system, the ounce is divided into 8 drams (60 grains) each containing 3 scruples (20 grains).
   There is a parallel system of liquid volume measure in which the fluid ounce is divided into 8 fluid drams (or fluidrams) each containing 3 fluid scruples. The apothecary system continued in use into the early twentieth century, but it has been replaced everywhere in pharmacy by the use of metric units. The abbreviation "ap." indicates apothecaries' units, as in "oz. ap." or "dr. ap."

Dictionary of units of measurement. 2015.

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  • Apothecary — A*poth e*ca*ry, n.; pl. {Apothecaries}. [OE. apotecarie, fr. LL. apothecarius, fr. L. apotheca storehouse, Gr. apo, fr. ? to put away; ? from + ? to put: cf. F. apothicaire, OF. apotecaire. See {Thesis}.] One who prepares and sells drugs or… …   The Collaborative International Dictionary of English

  • avoirdupois weights —    the common traditional system of weights in all the English speaking countries.    Until the introduction of the metric system, almost all weights were stated in avoirdupois units, with only precious metals being measured by troy weights and… …   Dictionary of units of measurement

  • Apothecaries — Apothecary A*poth e*ca*ry, n.; pl. {Apothecaries}. [OE. apotecarie, fr. LL. apothecarius, fr. L. apotheca storehouse, Gr. apo, fr. ? to put away; ? from + ? to put: cf. F. apothicaire, OF. apotecaire. See {Thesis}.] One who prepares and sells… …   The Collaborative International Dictionary of English

  • Apothecaries' weight — Apothecary A*poth e*ca*ry, n.; pl. {Apothecaries}. [OE. apotecarie, fr. LL. apothecarius, fr. L. apotheca storehouse, Gr. apo, fr. ? to put away; ? from + ? to put: cf. F. apothicaire, OF. apotecaire. See {Thesis}.] One who prepares and sells… …   The Collaborative International Dictionary of English

  • English unit — is the American name for a unit in one of a number of systems of units of measurement, some obsolete, and some still in use in present day USA, the UK, and elsewhere. The modern United States customary units system as a whole is not, and has… …   Wikipedia

  • United States customary units — A table of weights from the secretaries of states, showing the number of pounds that their laws recognize as a bushel of different commodities. c. 1854 United States customary units are a system of measurements commonly used in the United… …   Wikipedia

  • History of measurement — Units of measurement were among the earliest tools invented by humans. Primitive societies needed rudimentary measures for many tasks: constructing dwellings of an appropriate size and shape, fashioning clothing, or bartering food or raw… …   Wikipedia

  • Inventions in medieval Islam — A significant number of inventions were developed in the medieval Islamic world, a geopolitical region that has at various times extended from Al Andalus and Africa in the west to the Indian subcontinent and Malay Archipelago in the east.… …   Wikipedia

  • weight — The product of the force of gravity, defined internationally as 9.80665 m/s2, times the mass of the body. [A.S. gewiht] apothecaries w. an obsolescent system of weights based upon the w. of a grain of wheat. Has been used for centuries in… …   Medical dictionary

  • Dumas , Jean Baptiste André — (1800–1884) French chemist Dumas was educated in classics at the college in his native city of Alais and intended to serve in the navy. However, after Napoleon s final defeat he changed his mind and became apprenticed to an apothecary. In 1816 he …   Scientists

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