kil·der·kin 
(kĭldər-kĭn)
(kĭldər-kĭn)n.
1. A cask.
2. An obsolete English measure of capacity equal to 18 imperial gallons (81.8 liters).
[Middle English, alteration of Middle Flemish kinderkin, variant of Middle Dutch kindekijn : quintel, quintlein, quintal (from Medieval Latin quintāle; see QUINTAL) + -kijn, diminutive suff.]