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bois de vache

[bwah duh vash]
noun
  1. dried buffalo dung, used as fuel by Canadian and U.S. fur trappers in the 18th and 19th centuries.
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Origin of bois de vache

1835–45, Americanism; < Prairie Canadian French: literally, buffalo wood (vache buffalo, French: cow)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018