What does "apothecaries' ounce" mean?

a unit of apothecary weight equal to 480 grains or one twelfth of a troy pound

What is a synonym for "apothecaries' ounce"?

Common synonyms include: ounce, troy ounce.

Rare ·Advanced level

Noun

1
a unit of apothecary weight equal to 480 grains or one twelfth of a troy pound wordnet