kilderkin

[kil-der-kin] /ˈkɪl dər kɪn/
noun
1.
a unit of capacity, usually equal to half a barrel or two firkins.
2.
an English unit of capacity, equal to 18 imperial gallons (82 liters).
Origin
1350-1400; Middle English, dissimilated variant of kinderkin < Middle Dutch, equivalent to kinder (≪ Arabic qinṭār quintal) + -kin -kin
British Dictionary definitions for kilderkin

kilderkin

/ˈkɪldəkɪn/
noun
1.
an obsolete unit of liquid capacity equal to 16 or 18 Imperial gallons or of dry capacity equal to 16 or 18 wine gallons
2.
a cask capable of holding a kilderkin
Word Origin
C14: from Middle Dutch kindekijn, from kintal hundredweight, from Medieval Latin quintale; see kentledge