D defs.my
Entry 2 senses Webster, 1913

Firkin

· Fir·kin · IPA /ˈfɝkɪn/
01 n. A varying measure of capacity, usually being the fourth part of a barrel; specifically, a measure equal to nine imperial gallons.
  1. 1.
    A varying measure of capacity, usually being the fourth part of a barrel; specifically, a measure equal to nine imperial gallons.[Eng.]
  2. 2.
    A small wooden vessel or cask of indeterminate size, -- used for butter, lard, etc.[U.S.]