n. [ Cf. Sp. redundar to overflow. ] The lees or dregs of cane juice, used in the distillation of rum. [ West Indies ] [ 1913 Webster ]
The use of dunder in the making of rum answers the purpose of yeast in the fermentation of flour. B. Edwards. [ 1913 Webster ]
n. [ Prov. Eng. also dunderpoll, from dunder, same as thunder. ] A dunce; a numskull; a blockhead. Beau. & Fl. [ 1913 Webster ]
a. Thick-headed; stupid. [ 1913 Webster ]
n. See Dunderhead. [ 1913 Webster ]