Definition of "kilderkin"

kilderkin

noun
plural kilderkins
1. A small barrel.
2. An old English liquid measure, usually being half a barrel; containing 18 English beer gallons, or 83.178 L.
  Quotations
  Barrels came in firkins, nine gallons; kilderkins, eighteen gallons; halves, twenty-seven gallons; barrels, thirty-six gallons and hogsheads, fifty-four.
  1987, Keith Dunstan, The Amber Nectar, Ringwood: Vicking O'Neil, page 81