\begin{definition}[Definition:Avoirdupois/Dram]
The '''dram''' is an avoirdupois unit of mass.
{{begin-eqn}}
{{eqn | o = 
      | r = 1
      | c = '''dram'''
}}
{{eqn | r = 27 \cdotp 34375
      | c = grains
}}
{{eqn | r = \dfrac 1 {16}
      | c = ounce avoirdupois
}}
{{eqn | o = \approx
      | r = 1 \cdotp 77
      | c = grams
}}
{{end-eqn}}
\end{definition}