\begin{definition}[Definition:Apothecaries' Weights and Measures/Mass/Ounce]
The '''apothecaries' ounce''' is an apothecaries' unit of mass.
{{begin-eqn}}
{{eqn | o = 
      | r = 1
      | c = '''apothecaries' ounce'''
}}
{{eqn | r = 8
      | c = drachms
}}
{{eqn | r = 24
      | c = scruples
}}
{{eqn | r = 480
      | c = grains
}}
{{eqn | r = 1
      | c = troy ounce
}}
{{eqn | r = 31 \cdotp 1
      | c = grams
}}
{{end-eqn}}
\end{definition}