apothecaries' weight

n. A system of weights used in pharmacy and based on an ounce equal to 480 grains and a pound equal to 12 ounces. It has been largely replaced by measures of the metric system.

apothecaries' weight

n (Pharmacology) a system of weights, formerly used in pharmacy, based on the Troy ounce, which contains 480 grains. 1 grain is equal to 0.065 gram

apoth′ecaries' weight`

n. a system of weights used chiefly in compounding and dispensing drugs.

Thesaurus

Noun

apothecaries' weight - any weight unit used in pharmacy; an ounce is equal to 480 grains and a pound is equal to 12 ouncesapothecaries' unitweight unit, weight - a unit used to measure weight; "he placed two weights in the scale pan"grain - 1/60 dram; equals an avoirdupois grain or 64.799 milligramsscruple - a unit of apothecary weight equal to 20 grainsdrachm, drachma, dram - a unit of apothecary weight equal to an eighth of an ounce or to 60 grainsapothecaries' ounce, ounce, troy ounce - a unit of apothecary weight equal to 480 grains or one twelfth of a poundapothecaries' pound, troy pound - an apothecary weight equal to 12 ounces or 373.242 grams

apothecaries' weight

weight

[wāt] 1. heaviness; the degree to which a body is drawn toward the earth by gravity. (See also Tables of Weights and Measures in the Appendix.) Abbreviated wt.2. in statistics, the process of assigning greater importance to some observations than to others, or a mathematical factor used to apply such a process.apothecaries' weight see apothecaries' system.atomic weight the sum of the masses of the constituents of an atom, expressed in units" >atomic mass units (or daltons" >daltons), in SI units (i.e., kilograms), or as a dimensionless ratio derived by comparing the mass to the mass of an atom of carbon-12, which is taken as 12.000. Abbreviated At wt.avoirdupois weight see avoirdupois system.equivalent weight the amount of substance that combines with or displaces 8.0 g of oxygen (or 1.008 g of hydrogen), usually expressed in grams; for acid/base reactions, one equivalent donates or receives a mole of protons and the equivalent weight is the ratio of the molecular weight to the number of protons involved in the reaction. For oxidation-reduction reactions, one equivalent donates or receives a mole of electrons and the equivalent weight is the ratio of the molecular weight to the number of electrons involved in the reaction.gram molecular weight the molecular weight of a substance expressed in grams; one gram molecular weight of a molecular substance contains one mole of molecules. See also mole¹.low birth weight (LBW) see under infant.molecular weight the weight of a molecule of a chemical compound as compared with the weight of an atom of carbon-12; it is equal to the sum of the weights of its constituent atoms and is dimensionless. Abbreviated Mol wt or MW. Although widely used, the term is not technically correct; relative molecular mass is preferable.very low birth weight (VLBW) see under infant.