n. [ Blunder + head. ] A stupid, blundering fellow. [ 1913 Webster ]
n. [ Prov. Eng. also dunderpoll, from dunder, same as thunder. ] A dunce; a numskull; a blockhead. Beau. & Fl. [ 1913 Webster ]
n. A rounded mass of cloud, with shining white edges; a cumulus, -- often appearing before a thunderstorm. [ 1913 Webster ]
n. A blockhead, or stupid person; a dunderhead. [ Obs. ] Sir T. Browne. [ 1913 Webster ]