| NOUN | quantity | mass unit | a unit of measurement for mass |
|---|
| Meaning | A unit of measurement for mass. | |
|---|---|---|
| Narrower | atomic mass unit | Unit of mass for expressing masses of atoms or molecules |
| avoirdupois unit | Any of the units of the avoirdupois system of weights | |
| mass number, nucleon number | The sum of the number of neutrons and protons in an atomic nucleus | |
| metric weight unit, weight unit | A decimal unit of weight based on the gram | |
| slug | A unit of mass equal to the mass that accelerates at 1 foot/sec/sec when acted upon by a force of 1 pound | |
| Broader | unit of measurement, unit | Any division of quantity accepted as a standard of measurement or exchange |
| Spanish | unidad de masa | |
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