Source : Webster's Revised Unabridged Dictionary (1913)

Kilderkin \Kil"der*kin\, n. [OD. kindeken, kinneken, a small
   barrel, orig., a little child, fr. kind child; akin to G.
   kind, and to E. kin.]
   A small barrel; an old liquid measure containing eighteen
   English beer gallons, or nearly twenty-two gallons, United
   States measure. [Written also {kinderkin}.]

Source : WordNet®

kilderkin
     n : an obsolete British unit of capacity equal to 18 Imperial
         gallons