|1.||oz a unit of weight equal to one sixteenth of a pound (avoirdupois); 1 ounce is equal to 437.5 grains or 28.349 grams|
|2.||a unit of weight equal to one twelfth of a Troy or Apothecaries' pound; 1 ounce is equal to 480 grains or 31.103 grams|
|3.||short for fluid ounce|
|4.||a small portion or amount|
|[C14: from Old French unce, from Latin uncia a twelfth; from ūnus one]|
|another name for snow leopard|
|[C18: from Old French once, by mistaken division of lonce as if l'once, from Latin |
Abbr. oz, oz.
A unit of weight in the U.S. Customary System, an avoirdupois unit equal to 437.5 grains or 28.35 grams.
A unit of apothecary weight equal to 480 grains or 31.10 grams.
A fluid ounce.
In addition to the idiom beginning with ounce, also see more bang for the buck (bounce for the ounce).