
1) British capacity unit 2) Imperial capacity unit
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https://www.crosswordclues.com/clue/kilderkin

1) Cask
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https://www.crosswordclues.com/clue/kilderkin

Unit of measure. 1 Kilderkin = 18 Imperial Gallons
Found on
http://brewdudes.wordpress.com/beer-making-terminology/

old unit of capacity equal to 1/2 barrel or 18 gallons
Found on
http://phrontistery.info/k.html

• (n.) A small barrel; an old liquid measure containing eighteen English beer gallons, or nearly twenty-two gallons, United States measure.
Found on
http://thinkexist.com/dictionary/meaning/kilderkin/
Kil'der·kin noun [ OD.
kindeken ,
kinneken , a small barrel, orig., a little child, from
kind child; akin to German
kind , and to English
kin .] A small barrel; an old liquid measure containing eighteen English beer gallons, or nearly twenty-two gallons, United State...
Found on
http://www.encyclo.co.uk/webster/K/9

The kilderkin was a British unit of measurement applied to liquid equal to two firkins (18 gallons), and since the 19th century almost exclusively used by brewers to denote a half-barrel of beer.
Found on
http://www.probertencyclopaedia.com/browse/AK.HTM

[
n] - an obsolete British unit of capacity equal to 18 Imperial gallons
Found on
http://www.webdictionary.co.uk/definition.php?query=kilderkin

Unit of measure. 1 Kilderkin = 18 Imperial Gallons
Found on
https://www.encyclo.co.uk/local/21582

a unit of capacity, usually equal to half a barrel or two firkins. · an English unit of capacity, equal to 18 imperial gallons (82 liters).
Found on
https://www.infoplease.com/dictionary/kilderkin
No exact match found.