Source : Webster's Revised Unabridged Dictionary (1913)

Rundlet \Rund"let\, n. [Dim. of OF. rondele a little tun, fr.
   rond round. See {Round}, and cf. {Roundlet}, {Runlet}.]
   A small barrel of no certain dimensions. It may contain from
   3 to 20 gallons, but it usually holds about 141/2 gallons.
   [Written also {runlet}.]