What is "kinderkin"

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.]