#firkin.British_capacity_unit  a British unit of capacity equal to 9 imperial gallons
  supertype:  British_capacity_unit__Imperial_capacity_unit  a unit of measure for capacity officially adopted in the British Imperial System; British units are both dry and wet
  part:  Imperial_gallon
  part of:  kilderkin  an obsolete British unit of capacity equal to 18 Imperial gallons

No statement uses or specializes firkin.British_capacity_unit; click here to add one.