See also: tree bark English Etymology From tree + bark. Noun treebark (uncountable) The bark of a tree. 1971, Harold Henry Fisher, The famine in Soviet Russia, 1919-1923:Others, having no grain, made nauseating, poisonous concoctions of weeds, treebark, and even clay and manure.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads