Tunne-botm

According to the Old English Dictionary:

es;

tunne-botm

m. The bottom of a cask:--Tunnebotm (cf. byden-botm fundum, in the same list 'nomina vasorum') tympanum, the bottom of a cask used as a drum?, Wrt. Voc. i. 24, 55. [Dan. tønde-bund the bottom or the head of a barrel.] tunne-botm