pumpernickel
Concise Oxford English Dictionary © 2008 Oxford University Press:
pumpernickel /ˈpʊmpəˌnɪk(ə)l, ˈpʌm-/
▶noun dark, dense German bread made from coarsely ground wholemeal rye.
– origin C18: transferred use of Ger. Pumpernickel ‘lout, bumpkin’.
'pumpernickel' also found in these Oxford entries:

